This started happening a while ago when I was running 10.4.7. I didn't dig into it too much because I use Firefox for most browsing. Then I upgraded to 10.4.8 and all was well, Safari was working again. For a day or so. Now it does this (below) every time I open it, for every page I try. Doesn't matter, it simply won't browse anywhere. Meanwhile Firefox just keeps on working. 
I think I have a larger problem, I've seen this error a couple of times now and similar errors elsewhere. Also my Apple Help doesn't work at all. It just opens and shows a list of thing, but nothing is clickable. Any ideas?
Safari cant open the page http://online.wsj.com/home/us. The error was: POSIX error: Cannot allocate memory (NSPOSIXErrorDomain:12) Please choose Report Bug to Apple from the Safari menu, note the error number, and describe what you did before you saw this message

I think I have a larger problem, I've seen this error a couple of times now and similar errors elsewhere. Also my Apple Help doesn't work at all. It just opens and shows a list of thing, but nothing is clickable. Any ideas?
Safari cant open the page http://online.wsj.com/home/us. The error was: POSIX error: Cannot allocate memory (NSPOSIXErrorDomain:12) Please choose Report Bug to Apple from the Safari menu, note the error number, and describe what you did before you saw this message