I also noticed the line-in jack, but looking at the Creative Zen Nano (could Creative get any more confusing with the model names?) manual I discovred very limited recording capability -- not even 128kbps MP3 as I recall. So instead I bought an IRiver IFP-799. The IRiver records its own FM tuner (with a nice VCR type timer function) or line in (with gain adjustable via a buried menu) at any MP3 bitrate you choose, up to 320kbps. It doesn't catch anything beyond 16khz (don't know if this is due to some internal filtering or the method of MP3 encoding), but it sounds very good for all that. Oh yeah, no meters, naturally. Still not bad for the money. You have to be careful of the firmware version you use -- 1.25 supports high bitrate recording while 1.28 and 1.29 do not. Kudos to Misticriver for lots of good info on IRivers.
Yane