Wahwahpedal has already been blocked by MuZemike for egregious sockpuppetry, as explained at User talk:MuZemike/Archive 9#Wahwahpedal. I believe Xyz or die is also a sock, or possibly meat, puppet, based on this evidence, copied over from the talk page.
Piriczki has also submitted evidence, which I'll copy to the next section.
MuZemike could not confirm that they are the same user, but I believe that behavioral evidence is sufficiently incriminating for an indefinite block. Furthermore, because of the misplaced industry of this puppeteer it'll probably be good to have a formalized SPI. Favonian (talk) 13:34, 4 October 2011 (UTC)
Accused parties may also comment/discuss in this section below. See Defending yourself against claims.
I seconded your suspicions of User:Xyz or die at User talk:MuZemike/Archive 9#Wahwahpedal but it appears there is no interest in pursuing any further sockpuppets or the sockmaster. I have also noticed some curious editing patterns, particularly surrounding the article Beck and several related articles that have recently been deleted.
On July 14, Wikipedia:Articles for deletion/W.I.N. Records was nominated for deletion by the sockpuppet User:Huh direction. The same day, User:Huh direction also nominated Wikipedia:Articles for deletion/Tom Grimley (2nd nomination). After no activity, the Grimley article was relisted and received a delete vote from User:Xyz or die. Still having no consensus, it was relisted again and received delete votes from User:duffbeerforme and the sockpuppet User:Zalinda Zenobia.
On July 31, the article Wikipedia:Articles for deletion/The Poop Alley Tapes was nominated by User:duffbeerforme and received a delete vote from User:Huh direction.
On August 5, the article Poop Alley Studios was proposed for deletion.
On August 8, sockpuppet User:Know Your NME unlinked Poop Alley Studios and WIN Records in the Beck article (see [3]). I undid one of the changes because Poop Alley Studios was not yet a red link at the time. I initially noticed this edit because I assumed User:Know Your NME was a sockpuppet of User:Kim Cardassian.
On August 12, Poop Alley Studios was deleted. It would be nice to know which user proposed the deletion. I'm not privy to that information.
On August 16, User:Huh direction unlinked Poop Alley Studios (see diff)
Finally, on August 29 User:Xyz or die deleted the entire sentence that once had links to all of the above deleted articles (see diff).
It all seems peculiar to me. Thought it might be of interest to you. Piriczki (talk) 02:58, 4 October 2011 (UTC)
It's Likely that Xyz or die (talk · contribs) and Iommi Batujajar (talk · contribs) are the same. Unlike MuZemike, I do see a
Possible connection to the Wahwahpedal accounts, but behavior is likely to be a better indicator than technical data. TNXMan 14:38, 4 October 2011 (UTC)