Does anyone know how to update details on the Salesforce verification site, or where these details are taken from?
The site (in case anyone is unclear where I mean) is: http://certification.salesforce.com/verification
They're taken from WebAssessor I believe (where you take your exams and do release top-ups). If you update your details on there, it should sync up with Salesforce's Certification site.
Edit: I've just updated my details on there now (thanks for reminding me!) but it appears you can't change your log in details, normally the e-mail address you signed up with. I'm going to contact Krypterion now to find out if they can change it their side.
I've submitted a ticket to Salesforce/Krypterion to see if they can change this and will let you know what they say. Other details can be changed from the "Edit Profile" page, however.
Edit 2: As we discussed, you can change your account details on WebAssessor. Updating the e-mail field in there will update the e-mail address that's searchable on the Certification Site.