Mine goes in my pocket. Cases are a hassle, and it's a glass screen... Should be tough enough to put up with average use... by the time the glass screen gets dinged up, i'll be moving on to a better phone anyway.
I am using the same Body Glove carrier that I carried my Palm Treo Pro around in. Did not care for their OEM sleeve....too tight. I ordered something off of the Internet but it is not a custom fit...and may not be better than what I now am using. Oh, well....can't wait for Body Glove to have a Nexus One carrier!
in my pocket, using the supplied neoprene sleeve, which actually I find extremely handy and a good idea... which i never thought I'd like when first opening the box... my first reaction was "how stupid"... but actually it's brilliant! i'm a "caseless" type of guy... i had 2 iphones and hated putting cases on them, and just ended up carrying them naked... but that leaves them unprotected.... at least with the sleeve, gives the Nexus some cushion... but when actually using it, there's no case to ruin the experience... it feels so nice in hand, i wouldn't want a thick clunky case ruining that....
I'm going naked. I used the Verizon latex cover on my Storm for a year until I got sick of trying to pull it out of my jeans pocket. I've since gotten over my paranoia, and now I go nude. It's just too pretty to cover up with a case.