Coffee or caffeine is good for a lift and has some fat burning benifits. On the down side it is a dieritic so when you take it to soon before a workout, you are reducing your hydration before a workout, which should be higher not lower. Also, if you supplement with a product like creatine which helps retain and transport water to your muscle you are basicly nulifying that by drinking too much coffee.
That being said, I am on my 5th big cup of the day of coffee. I love it and damn it, some times you have to just no your shortcomings, coffee is mine.
I do try to cut the coffee intake about 2-3 in the afternoon.