Here's some advice based upon my experiences. First, do your joints hurt throughout the full range of motion or is the pain limited to one portion of the lift? Also, what exactly hurts? If they hurt throughout, you're kind of screwed. I've yet to find a replacement exercise for bench that will allow me to maintain. It is easy to regain the lost strength upon returning to bench but you'll have to expect a decrease in your bench numbers. If your joints ache throughout, I'd choose a bench replacement (dumbell press, incline press, etc.) After your muscles are properly fatigued, throw in 1-2 sets of bench press at a low to moderate weight. Judge the weight based upon how your body feels as opposed to %'s of your 1RM. Keep the reps in the 8-10 range.
If you're fine throughout most of the lift but suffer through one portion (namely the lockout or bottom portion), then work around it. This may be especially beneficial depending upon the weakest link of your lift. If you're feeling pain at the pec/humerous insertion at the bottom then you'd do very well following the advice already given in regards to board presses (either 2 or 3 2X4's) or floor presses. You could even bench in the power rack and really work on the lockouts. If your elbows are bothering you at the top of the lift then you may want to bench light with a cambered bar (assuming you have one). Going back to "normal" bench press will feel like a lockout. Anyway, I'm sorry if this is incoherent. It's 4:45am, I can't sleep and would have to get up at 6:30 even if I could. Anyway, good luck and keep us posted.
Oh yeah, one last thing. I've gotten some amazing results by using Vioxx. Other anti-inflammatory meds don't even come close.