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The TouchPad makes a good podcast device given its good multi-tasking, and this app is a great way to handle them. Podcast feeds are easily added for automatic streaming or downloading. The internal player is simple but works well, and remembers the current location for leaving and coming back when time permits. $2.00.
Tablets are good for watching video on the go and Rev3 is a good interface for the Revision3 online network. This network hosts lots of popular video podcasts such as Diggnation and Tekzilla. The Rev3 has an internal player for simple viewing of your favorite Revision3 show. Free.
This twitter app handles multiple columns for easily following your friends, mentions and direct messages. It recently gained the ability to work with lists and the columns can be dragged and dropped in the desired order. This is one of the few twitter apps I have used on any platform that works just as well in portrait and landscape orientations. Spaz HD is a great twitter app and is open source and produced by volunteers. Free.