Don't put bugs in! (Score 1)

I know it sounds a bit cheesy, but the trick is to make sure there are very few bugs in the product before you enter test. Try things like code reviews, spend time on removing defects early on in your process. Read a few books on how to achieve high quality programs. There are lots of books on software quality and process stuff, Rapid Development by Steve McConnel is one of my favourites.

Testing won't make a bad product good no matter how long you test it, you will only find lots of bugs. Testing a good (high quality) product will confirm that it is OK. Testing is a very inefficient way to find defects. Mind you that doesn't mean to get rid of testing!

Thomas