I have been mapping since 1999 for the Half-Life mod Team Fortress Classic and am part of the mapping/game editing clan [WTF?]. Currently working with the HL2 Source engine. I have a bunch of released maps other than what's posted here, but I posted my favorites. If you want to see all my maps, check out my website.
Chemswamp is what I feel to be my best map to date. Several gameplay elements were kept in mind while designing all the areas of the map, including tons of amazing combo ramp slides.
Chemfort quickly became one of my most popular maps after being played in a few North American and European leagues. It's a classic shutdown CTF level, with great gameplay. Can you find the secret tomb?
The team whom the base belongs to only easily accesses the upper level of the bases in Frostbite, much like the Valve map ?rock2?. This creates lots of great sentry gun locations.