Not at all?!
If you do not have a dedicated rig and an efficient GPU (read ATI 5xxx or 6xxx series) it's not worth the cost of electricity, noise and heat. If you do, join a pool.
You should get hashes 1,000 times that amount, that would give you 0.25 BTC per day in mining. Of course, if you want to do it just for fun / enjoying the technical side of it, go ahead. You might get a couple of Satoshis.
