I mentioned some of my thoughts about using this service at the GLMA blog this morning.
I think I didn't like it much the last time I tried it because I already had too many "buckets" to check. Home email, school email, feed reader, etc. But lately I've been trimming my feed reader down to give myself more actual reading of books time and they've opened up Twitter at my school. When I'm home I'm one of those odd ducks that likes to actually interact with their families. But lunchtime at school? I'd much rather see what's up on Twitter which is more like an interactive feed reader to me at this point.
Let me know of any tips you have since I've just started dipping my toe back into it.