For reference:
IDNet have ascertained that their LINX peering fell over. They've removed LINX from the network and this has brought everyone back up again, as far as we can tell. This may be related to the problem people were experiencing Monday (?) evening.
Yes, I thought it was only the forums too, as I could get BBC News OK earlier, but the whole thing, emails, the lot, went down for me about 10 minutes ago, for probably about 5-10 minutes. There's obviously something going on somewhere.