Yeah its been happening a lot to me too.
Most annoying when youve just finished a pm or reply.

Yeah, 4 posts in the last few days never made it on to the forums because when I hit "Submit" I get "Server is too busy at the moment. Please try back later".

And one was HUGE!!!! LOL!

Another thing I'm noticing....when I log on, threads I just read before getting the error are in bold as if I haven't read the latest on that thread.

I think it may be a problem processing cookies, even though I dumped my cache and it is still happening.....but it is happening on a more regular basis!

I've been noticing the opposite - if I've got the server busy message and I come back later, it's apparently still logged me as visiting the site since there will be non-bold threads with posts i haven't read, that don't show up in the "New posts since your last visit" list... And it seems that I can never get on in the mornings (UK time) but later in the evening I can usually get at the site.

I had it happen twice today, and about three times in the past week or so. Could be that this site is just so darn popular :D

you may be right, this site has grown a lot. maybe it cant handle all of us on at the same time?