I have been using twitterberry for awhile and wasn't thrilled with it. I didn't like how you couldn't reply to people and the updates are not so frequent.

After looking at berryreview I see there is a new app called tinytwitter

Has a scrolling bar on the bottom with latest twits and is easy to use and works fast...

check it out at berryreview

TinyTwitter - Twitter For Free From Your BlackBerry | BerryReview

I have already removed twitterberry.