Well, the please don't swamp us plea didn't work - if you went to Glastonbury Registration at 8am, you were more than likely to get a redirect to, erm, SeeTickets front page. There was a page which explained what was happening:
We're sorry, but in order to provide a fast and efficient service, we have limited the number of simultaneous users of our registration system.
At the moment, we are very busy. Please note that registration is not first come first served. You can register at any point between 1st February and 28th Februrary. Everyone will have an equal chance of getting a ticket when they go on sale.
If you're struggling to get access, it might be best to try in a couple of days, or at a non-peak time such as during the working day, early in the morning or late at night.
Alternatively, you can try again at www.glastonburyregistration.co.uk.
... but shouldn't that have been the page the redirect went straight to, rather than the ticket agency homepage?