iPod help

[valis2]

I went with a Zen mp3 player because I wasn't in love with iTunes/iPod.

Now I find that I have to load a ton of music (1,000+ songs) onto a brand new iPod. The songs I have are all in .wma format, and need to be in .aac format for the iPod player, I presume.

I can find no other method of converting them, save to convert each song one at a time. However, my time is incredibly slim, as I'm leaving in a week for a long trip, and I'd rather not sit and convert each file one at a time.

I'm holding out hope that, once plugged in for the first time, it will start up a sequence that goes to all of the music, converts it to .aac, and downloads it to the iPod, all with minimal fuss on my end. Yeah, and I'd like a pony, too.

Anyone know of these matters? Any ideas or help?

ETA: And it won't convert any song numbered 10 on an album. ha!

ETA2: Thanks, innerslytherin!