I searched around, only the Archos 5 and above seem to have AAC support and even then it's only after you buy the plugin to watch h264 videos.
As for Sandisk, i was surprised that they don't officially support AAC. The most i've gotten is that they generally play AAC files (due to being able to play h264 videos) but it's not properly/officially supported and reading the tags can be so-so.
Rather disappointed with that seeing as both companies are rather... "popular" manufacturers and Archos' support used to be free.
Yeah, they changed it when they raised the bitrate to 256kbps IIRC?
+ Are the videos/movies still DRM'd though ?