First off, let me just say that I'm have been very very pleased with the reception I've gotten for my recently released L4D map. I've been doing pretty regular updates to it, and people are responding well. At the time of this post it has 1765 downloads and a 3.77/5 rating on L4DMaps.com
I also released a map that was ENTIRELY made as a joke. It's just a giant hallway, with four miniguns at the end and a near infinite supply of pills and medkits. I was able to hold out by myself for 20 minutes until I got bored and quit. I uploaded it to the site, and people really ran with the joke. It's up to 653 downloads itself.
There's been a lot of controversy going on lately with regards to Valve's announcement of L4D2 and I'm still mulling it over in my head, but expect a new thoughts post regarding it shortly. And if you haven't gotten the chance to check out my map yet, give it a look.