Also, would this be a good time to ensure that usernames in ipb_address are properly normalized? It seems that at the moment, on enwiki at least, some of the entries contain underscores and some spaces, the choice seeming quite random:
http://en.wikipedia.org/wiki/Special:Ipblocklist?ip=+ http://en.wikipedia.org/wiki/Special:Ipblocklist?ip=_
-- Ilmari Karonen
Also, there's a problem with long usernames.
Compare: http://en.wiktionary.org/w/index.php?title=Special%3ALog&type=block&... http://en.wiktionary.org/wiki/Special:Ipblocklist?action=search&limit=15...
This must have already been reported at bugzilla, but perhaps this is also the good moment to fix that.