TwitterPowerSearch is a very sleek interface that shows trending in 6 colored boxes. These built-in terms are editable and the colors changable. A quick search feature is also located at the top. What is interesting is seeing multiple search terms updating at once in a pleasing interface.
At the bottom of the pages below the search boxes is the past Twitter trends by the house for 24 hours and then daily for a week. If you want to see what was hot the past few hours or days, this site has it ready to go. I found it useful watching for hastags and some keywords around a recent event.
What is not good is I cannot act on these tweets coming across. No ability to reply, retweet or anything at this point. I know it is beta 1 and hope they have much more planned.