Almost all of my system now runs on 18.104.22.168. I did have problems with 2.6.26.x when it was launched initially, mostly because NVIdia driver and also my lack of knowledge while configuring for the new feature. It seems that choosing 4KB stack instead of using the default 8KB stack is a bad idea (in my case), so i repeated the process and leave the old setting and NOT using 4KB stack and everything works well.
Just for some clue, my kernel configuration is already uploaded on my Box under kernel directory. Have fun with it. You might want to change several things to match your system though