a quick note re: embedded album art - I've had some continued difficulty getting art to display on win mobile players (tcpmp, s2p, microfi-nitrogen, mortplayer). After much confusion I resolved the issue. I'm not intimately familiar with embedded album art conventions so I'm not certain exactly what tags are involved here, but using mp3tag program, selecting 'set cover description' and changing this from 'cover.jpg' to anything not containing a '.' (ie just "cover") fixes the issue and art now displays fine in all the above mentioned players. If it isn't particularly difficult some folks might appreciate this, apparently more compatible, naming convention being used by default. Particularly as I've not found any way of changing 'cover description' save one file at a time in mp3tag.
Hopefully this info can save others a bit of a headache...