Not directly, but it's possible that if someone liked the site and found what they were looking for through one of the ads, if they remember your site they may come back again directly to the site another time.
google adwords... I used it for my site when i just started it. I had a free 25 dollar voucher for it so i tried it out.. i got 575 hits in 3 days... so to answer your question yes.. I believe they do work. But I think it depends on the key words you choose as well.
try it out ... you can set you spending limits and everything.. nothing to loose
[edited by: Marcia at 7:16 am (utc) on Feb. 16, 2004] [edit reason] Sorry, no URLs please. [/edit]