Apologies for any issues connecting to the site. We’ve no idea what’s causing the problem, but our host has been contacted and I’m poking around in the guts of the blog’s config files trying to sort it out.
In the mean time if you get the error message about memory and wp-db.php line 855 just please hit your browser’s refresh button, I don’t recommend just going to the address bar and hitting enter again — this is more likely to load from cache and just give you the error message again (because the browser will simply fetch the error message from its own memory rather than actually trying to connect to the site again — ain’t computers grand!?).
With luck this should be sorted out by end of the day.