I’ve never actually bought anything off of the iTMS, and I also got tired of downloading their free “single of the week” which seemed to never be anything which actually interested me anyway. But whenever I have gotten a free single I’ve always unlocked it with Hymn, just as a matter of principle.
I’ve been thinking about eMusic too, though the problem I have with pretty much all pay downloads is that they’re never encoded very well IMO. They all seem to use CBR, which is always either too high or too low (while VBR is usually Just Right) and so on. But I haven’t tried eMusic’s selection yet, so they might actually be sane. 🙂