My site gets 50 unique hits a day mostly from relavant search terms in the major search engines and has 300 impressions from that a day. Would it be worth my time to add adsense ads to this site?
its depends upon your site, do you sell any products of your own and that is a hot product one in the market, then don't put adsense in your site, getting traffic is the main thing in a successful internet marketing and you can't sent out them for some pennies. If you don't have anything like that (niche product) to sell then you can consider adsense to place on your site..
hm, let's say 50 uniques a day, you'll have around 5 clics a day, about a dollar a day? now, this could go from 0.10$ a day to 3$ a day depending on the theme etc, but that's the kind of revenue you should expect.