I finally got the big (actually pretty small) box of CashDuck business cards from VistaPrint. They're pretty good quality, I'd say the paper is the same weight as my work business cards which were probably 4x as expensive! The color is nice and clear, and the edges look crisp. All in all they're very nice and well worth the $35 or so I paid for 1000 of them (both sides full color, too.)
I was not so pleased with the return address labels I ordered - despite the fact that I used one of their pre-made templates for the design, the printing is WAY outside the borders. It looks like it was intended to fit (the image is cut off at the edges and rounded at the bottom corner) but it doesn't. And I don't think it's misaligned or anything. When I designed the business cards, they gave guidelines and showed on the screen where the image should be to ensure that nothing gets cut off, since I uploaded my own design - but I kind of assumed that their own pre-made design would also be pre-aligned. The quality is good though - it's more of a sticker weight paper than the address labels you get on a roll.
The notepads, postcards, and folding cards are also pretty nice, especially considering they were free! I'm still waiting on the rubber stamp but a) I don't really need a rubber stamp and I just did it because it was free, and b) Claire [tiredbuthappy] said that they stink. So we'll see.
Oh, and on the off chance that anybody's interested in having some to give to all your friends and admirers, send me an email at email@example.com with your address and I'd be thrilled to mail you some. ;)