So, it looks like it was just a dying bit of spin from Alistair Campbell.
Alexa's traffic info on labour.org.uk showed that the traffic to the website on the 11th May (the day Campbell claimed the site crashed due to "all the people trying to join" was not really any higher than it usually is, and in fact was nothing like the spike the site saw just before the election.
The "too busy to join" message was nothing to do with traffic to the site, which was not much higher than any other busy day.
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