<p>I just started using <a href="http://www.lizardl.com/PageHtml.aspx?lng=2&amp;PageId=18" rel="nofollow noreferrer">Log Parser Lizard</a> to examine my IIS and Event logs. </p>

<p>What UI tool do you use on top of LogParser 2.2 to view your log files on production?</p>

Sadly when it comes to Log Parser, I do it CLI, not GUI.  I have not had great need to do lots of parsing (though I probably should since resource utilization is occasionally a problem) so I've always used the SQL-like syntax of LogParser straight up.
Other app teams at my work use
Log4Net Dashboard
, which apparently parses log4net logs, event viewer, and other stuff in one web based interface.  I've not gotten around to checking it out, but other people seem to like it.
For web logs I'm actually starting to look at
awstats
for my parsing needs so I can see my data in a more visual format.