I would like to dispute the fact of closing my question, The best Tail GUI as not constructive.
Logging is an essential tool for programmers all across the board and finding and picking the best tool for the job of monitoring and searching through live log files is certainly valuable knowledge.
The question was initially created to serve as a first hand repository of available best of the breed GUI logging tools on the market and has so far served it's purpose just fine.
The tooling advances over time and as new and better tools become available, I expect people to add to the list, so the topic could become a de-facto listing of available log file monitoring tools along with the optional ordering based on the popularity of the tool provided by people voting for their favorites.
This is a fairly old question (it's been there for couple of years now - asked Sep 25 '08) and there is almost none of the "argumentative" or "debatable" or "discussiony", in the answers so far.
I also believe that the potential usefulness of the answers over the time would be beneficial to all programmers as long as there is a continued need for a log monitoring software.
Please reopen the question as it seems to be closed a bit over zealously - only superficially considering the wording of a question instead of looking into it's long term impact.