Dear god I hope nobody buy's these. Creative's should fit, it is same dimensions except double the depth, just not as comfortable as say, a nano.
OK, I think I've found the perfect gift for that tech geek in your life who has everything. The iBoxers:
<http://tinyurl.com/84b3j>
From Gizmodo: "Lots of people have iPods nowadays. Why not buy one more accessory for it that?ll really turn some heads, like, say, The iBoxer? For only $22 apiece, you can be the proud owner of underpants that have a specially-designed pocket on the side, a perfect place to store that iPod of your choice. So the next time you feel the need to saunter about in your unmentionables, at least you can be groovin? out to your favorite tunes."
Bet that Creative knock off won't fit. 
Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic