Ok - I did a search and found the posts where we went over this stuff last month, but it is a common newbie question so I'll just reply again.

Here is how I look at pot odds and implied odds.

Pot odds = just straight math and you should just look at it on a street by street basis.

Pot odds get confusing because some people look at them as ratios and others look at them as percentages. I.e. saying that your pot odds are 2:1 is the same as saying that they are 33%. Your odds for catching your outs by the next street need to be better than your pot odds for it to be a +EV play based on pot odds alone.

Implied odds takes it one step further and makes you guesstimate how much more you can piad off if you do hit your outs. I.e. even if the pot odds are 33% (or 2:1) and your odds of hitting your out on the next street are only 25% (or 3:1) if you do hit your outs what are the chances that your opp will pay you off? If those chances are high, you can then make a -EV pot odds call based on the implied odds that if you do hit, you will be paid off huge.

So long story short - figuring out pot odds is just straight math that all poker players must learn; implied odds is using your instincts.