Misc. iPod touch notes: Different screen, has small speaker, only music from WiFi store

A few miscellaneous iPod touch notes:

The screen is different in many ways from the iPhone. It seems somewhat brighter, but also appears to lack the level of contrast.
As previously noted, there is no visible internal speaker on the iPod touch. However, there is actually a small internal speaker that outputs tap noises for the keyboard and some other alerts. This speaker cannot playback audio from the iPod function (music/videos) or from Web content.
The WiFi iTunes Store only permits the purchase of music, not movies or music videos.