apt-get install terminator It's a wrapper around gnome terminal that allows you to split your terminal both horizontally and vertically. What makes this supercool is that you can have multiple tabs with different terminal layouts.
This is particularly handy when you are performing code debugging and monitoring of multiple log files. Also, another tip that I recently learned was that you can use the unix command tail -f with multiple log files - as logs are generated, the source filename is clearly displayed in the tail output.
Finally, I've been playing around with generating web server statistics for our apache tomcat webserver - the two that I like are webalizer and awstats.
Webalizer is pretty easy to set up and use, I came across a good howto on setting up awstats on Ubuntu here.
Both have their pros and cons, however I feel that awstats looks more polished and provides some really in-depth details covering things like average visitor duration and site entry and exit points.