What do you guys think of advertising on google?  Is it worth it?

Google adwords is probably the best pay per click program out there.

Bidding the same on yahoo and microsoft, but adwords gives the most impressions.
I also like google more because you bid any amount you want, unlike the others where you have to bid at least 5 cents.

Just make sure you manage your bids, and find what's right for your business to obtain profitability.  You'll have to try different amounts.

thanks,

do you know of any other ppc programs where u can bid as low as a penny?

Those are the only 3 i've used and that I trust.