here's a script that reads your lastfm playcount using the web services and then writes the response to your file tags. it only runs after the track has been playing for 60 seconds. it's not interactive in anyway so the panel should be hidden. just add a new column (default is LASTFM_PLAYCOUNT) and play your music as usual.

var username = "";
var api_key = "";

var sync_playcount = 1;
var playcount_tag_name = "LASTFM_PLAYCOUNT";
var sync_loved = 1;
var loved_tag_name = "LASTFM_LOVED";

function on_item_played() {
	sync();
}

function sync() {
	//no point querying last.fm if both options are turned off
	if(sync_playcount == 0 && sync_loved == 0) return;
	var g_metadb = fb.GetNowPlaying();
	var artist = encodeURIComponent(fb.TitleFormat("%artist%").EvalWithMetadb(g_metadb));
	var track = encodeURIComponent(fb.TitleFormat("%title%").EvalWithMetadb(g_metadb));
	var url = "http://ws.audioscrobbler.com/2.0/?method=track.getinfo&api_key=" + api_key + "&username=" + username + "&artist=" + artist + "&track=" + track;
	xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	xmlhttp.open("GET", url + "&s=" + Math.random(), true);
	xmlhttp.setRequestHeader('User-Agent','foo_lastfm_playcount_sync');
	xmlhttp.send();
	xmlhttp.onreadystatechange = function() {
		if (xmlhttp.readyState == 4) {
			//un-comment the following line to see full server response in console
			//fb.trace(xmlhttp.responsetext);
			if (xmlhttp.status == 200) {
				var xmlDoc = xmlhttp.responseXML;
				var y = xmlDoc.getElementsByTagName("userplaycount");
				if(y.length == 1 && sync_playcount == 1) {
					var lastfm_playcount = xmlDoc.getElementsByTagName("userplaycount")[0].childNodes[0].nodeValue;
					var old_lastfm_playcount = fb.TitleFormat("%" + playcount_tag_name + "%").EvalWithMetadb(g_metadb);
					if(lastfm_playcount != old_lastfm_playcount) {
						fb.trace("Updating: " + playcount_tag_name + " " + old_lastfm_playcount + " -> " + lastfm_playcount);
						g_metadb.UpdateFileInfoSimple(playcount_tag_name, lastfm_playcount);
					}
				}
				var z = xmlDoc.getElementsByTagName("userloved");
				if(z.length == 1 && sync_loved == 1) {
					var lastfm_loved = xmlDoc.getElementsByTagName("userloved")[0].childNodes[0].nodeValue;
					var old_lastfm_loved = fb.TitleFormat("%" + loved_tag_name + "%").EvalWithMetadb(g_metadb);
					if((lastfm_loved == 1 && old_lastfm_loved == "?") || (lastfm_loved == 0 && old_lastfm_loved ==1)) {
						fb.trace("Updating: " + loved_tag_name + " " + old_lastfm_loved + " -> " + lastfm_loved);
						g_metadb.UpdateFileInfoSimple(loved_tag_name, (lastfm_loved == 1) ? 1 : '');
					}
				}
			}
		}
	}
}

• Now playing track only
• Access to various track info (with mousewheel)
• Automated text scrolling (horizontal)
• Configurable colors (click on the toolbar)

Maybe with executing directly sqlite3.exe on customdb_sqlite.db, or through ODBC Driver then connecting:

but not to update if the track already exist because of "database locked" error.

Set oConn = CreateObject("ADODB.Connection")
oConn.Open "DRIVER=SQLite3 ODBC Driver;Database=C:/Users/Some Name/AppData/Roaming/foobar2000/customdb_sqlite.db;"
Set oRS = CreateObject("ADODB.Recordset")

strQuery = "INSERT OR REPLACE INTO quicktag (url,subsong,fieldname,value) values (some key,-1,some field,some value);"
oRS.CursorType = adOpenstatic
Set oRS.ActiveConnection = oConn
oRS.Open(strQuery)

oConn.Close

fb.RunContextCommandWithMetadb("Legacy commands (unsorted)/customdb delete playcount",g_metadb);
var query1 = '\"INSERT INTO quicktag(url,subsong,fieldname,value) VALUES(\\"' + crc32 + '\\",\\"-1\\",\\"' + playcount_tag_name + '\\",\\"' + lastfm_playcount + '\\")\";';
WshShell.Run("sqlite3.exe customdb_sqlite.db " + query1);

i have a workaround. create an action in the customdb preferences to delete the field and then trigger it using WSH panel mod before running the sqlite command.

function WriteCustomDB(artist,album,title,field,value){

var urlstring = artist+ ", " + album + ", " + title;
oDb = new ActiveXObject("LiteX.LiteConnection");
oStmt = new ActiveXObject("LiteX.LiteStatement");
oDb.Path="customdb_sqlite.db";
oDb.open();
oStmt.ActiveConnection = oDb;

	try {
		oStmt.CommandText = "INSERT OR REPLACE INTO quicktag(url, subsong, fieldname, value) VALUES(:url, :subsong, :fieldname, :value)";
		oStmt.Prepare();
		oStmt.BindParameter(":url", urlstring);
		oStmt.BindParameter(":subsong", -1);
		oStmt.BindParameter(":fieldname", field);
		oStmt.BindParameter(":value", value);
		oStmt.Execute();
}
	catch(e){
		 fb.trace( e )
		 fb.trace( "Number: ", e.number>>16 & 0x1FFF, e.number & 0xFFFF );
		 fb.trace( "Message:", e.message );
		 fb.trace( "Description:", e.description );
	 }
	finally {
		oStmt.Close();
		oDb.close();
	}
}

isn't db locked anyway?

i can't register that dll on windows 7 64bit. i get some error.

It doesn't seem to be that way on my PC: If foobar is playing db is locked (can't add any new field), if foobar isn't playing I'm able to update any field

var t = fb.TitleFormat("%playback_time_seconds%");
function on_playback_time(time) {
    if(ok && t.eval() == 10) sync();
}

i'm using on_item_played to write tags to a file. but if the track is less than one minute, the function runs on the next track as soon as it begins playing, totally skipping the previous short track.