There is defiantly room for a good preferably free Twitter sentiment tool. I think the three application examples above work best for brands with lots of discussion around them, like the screen shot examples given for Napster.

However, I just used all three of these and none of them seemed to work properly. In fact the first one was the only one that delivered any result at all and that was dubious. You have got me thinking about whether I should create a useful Twitter sentiment feature for Tweasier. I think I will link to this post and add a few others. Thanks