Rated 5 out of 5 stars
A couple of days ago hashtags.org started working again. It seems they have dropped "tag/" from their URL scheme though, so it would be nice if that could be updated in TwitKit. Also, a preference to use Twitter's own hashtag search would be cool too.
@Anonymus1984AD You have to add the icon to your toolbar. Right-click near your address bar and "customize" to add/remove icons including TwitKit, Delicious, etc. Alternatively, you can open/close it manually via "Tools > TwitKit > Open/Close".