I think the server too busy is becoming very annoying, this is happening very frecuently
It is annoying especially when you're in the middle of posting a reply with links ;-)
There are certain indicators, though, when it's about to happen - taking a while for the formating to fill in on a major page. I've gotten into the habit of highlighting and taking to the clipboard a reply composition just in case that happens.
And liscab... watch your "c's" and "q's". ;-)