If you're using the Zenographics CUPS v1.1 driver with an HP LaserJet 1000, you may find that you can't print from Adobe Reader 7. Adobe recommends using the latest print driver for your printer, but alas, the Zenographics driver is a hack.
My solution is to print your PDF with Preview. OS X offers many of the same output options as does Adobe in the Print dialog box.
[robg adds: I'm not sure we've ever printed this good piece of general advice here ... since OS X can print PDFs natively, if you ever have trouble printing one from Reader (or the full Acrobat), try printing from Preview -- and vice-versa. You never know, as shown above, it just might work.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=2005032123074975