What a pain in the ass, I had 64 errors on http://abecx.net, down to just 2 now, about to finish up. I still have to do all my underlying pages, but I'd rather have my code correct than incorrect, never know who is looking at your site!
Validation is a crazy pain in the ass for sites using any kind of scripting. Anything more than html/xhmtl+css will likely fail. I usually don't bother even trying. I'll check my sites in IE and Firefox, and if they look alright, then that's good enough for me.
Graphic Design / Photography / Web Design
I just finished all the pages, I feel like I've taken a bath or something. I had a lot of page codes that were wrong, or not even used, like doing the height on an opening table, browsers dont even use that. All of pages now are just include files, for instance, here is the video page: