Just a quick note.... I have been allowing in lots of people as I have been getting quite a bit of new traffic from searches for their username - EG Smaxor searches send me a few people every day to his profile page.
With that tactic comes some risk of course and so today I came across a polish forum where someone had posted the fact that being a member at my forum was a good way to get a pharms backlink... time to act
If you edit the Profile.template.php to add a nofollow on the link it should slow them down a little
Something like this: -
<td><b>', $txt[96], ': </b></td>
<td><a href="', $context['member']['website']['url'], '" target="_blank" rel="nofollow">', $context['member']['website']['title'], '</a></td>
</tr><tr>
<td><b>', $txt[113], ' </b></td>