I used playlists a lot with iTunes and the iPod. The AK120 is more limited; you have to drag and drop tunes from the player into generically named playlists.
Since I used to have a lot of playlists with genres like 'Bluegrass', 'Folk', 'Soft Jazz', etc. I'm thinking that maybe using a program like jRiver to make lists and then load them onto a number of micro SD cards might work? Still kind of clumsy I guess, but at least I could have a variety of genres to pick from.
Anyone try this yet?