Can Sansa Clip bookmark long mp3/wma files?

I am planning to buy a Sansa Clip 2GB. I have read that with a firmware upgrade, it will have a bookmark feature. Does this include mp3 and wma files? Or does it just apply to Audible content? I listen to a lot of lectures that are mainly in mp3 format, so I would love to have a bookmark option for these. Thanks.

They apply to any files (mp3 or wma) put into the Audiobooks folder or having the Audiobook genre tag.

Perfect! Thanks.