Twellow had already become my go-to source for finding people on Twitter by category. It's been a huge help when I've needed to connect with certain professions, allowing me to find people then see if we have mutual follows and get real recommendations from those follows. I've sourced several helpful people that way.
By adding Trending Categories, Twellow now offers up to the minute information right on the front page about what people are talking about and searching for most at any given time. You can even find out more than just the category being discussed. By following the link to the category that is trending, then clicking "what people are saying," you'll see the conversations and who is having them about that category, making this tool quite useful for optimizing your time on Twitter.
The Recently Claimed Profiles lets you find and connect with people that are new to Twellow. If you are looking for fresh voices in the Twitterverse, this will be a handy tool for finding them. Recently Updated Bios offers a look at people who are active on Twellow. If you are anything like me, you visit Twellow once in a while and make sure your bio is fresh. This means you can now find people who do the same and see what's new with them.