Creative issued a recall of more than 3,700 Creative Zen Neeons that shipped with the Wullik-B e-mail worm (a Windows virus that emerged in 2004). Luckily for us in the States, the colorful 5GB Zen Neeon is not available here--it's an Asia-only product, and the recall affects those players sold in Japan since July.
According to a Creative press release, serial numbers between 1230528000001 and 1230533001680 are affected. There have been no reports of users being affected by the virus.