I’ve been sitting on this one for a while (patiently waiting for a fifth search engine to emerge).  Enter Tweetag (thanks TechCrunch!).

Here are the inaugural five (subject to change…any others out there?):

• Twitter (official)  There is an undeniable need to search, filter, and otherwise interact with the volumes of news and information being transmitted to Twitter every second. Twitter Search helps you filter all the real-time information coursing through our service. (author’s note: We love the fact that Summize came out of Virginia!)
• Twitter Troll A search engine strictly for indexing and searching Twitter posts.
• Tweetag Tweetag gives you a unique way to browse through all the public tweets published on Twitter.com  By selecting certain tags, you can also define the scope of your search and discover new topics related to them
• Twellow Twellow.com is able to assist you in finding real people who really matter. We’re doing the hard work of sifting out people who can help bring your vision to reality, whatever that vision might be.
• Twitter Scan In the innovative world of Microblogging, one site aims to organize it all. Tweet Scan searches Twitter, identi.ca and other Laconica-based sites with more being added all the time.

To add the Twitter Search channel to your ButtonALL you can go to the customization screen and scroll down on Blogs :: Twitter Search. OR just click here (click once, or it’ll continue to add this search row. Remember, you can always delete and re-arrange in the customization section)