Re: Oly 'Prime Lens' - advice required please...
Some personal experience here... I also volunteered to do a friend's wedding, and had never done a wedding before. It was a real experience.
You have plenty of glass. I shot the entire wedding with the 14-54 and 50 Macro, pausing to pull out the 50-200 once. Fired almost 1000 shots, should have shot more. The 11-22 will be great, as weddings tend to be crowded.
Your biggest problem is keeping track of what's going on. Weddings move very fast (despite what observers might think), they never go exactly as planned, and you're going to have a tough time keeping up, especially if you haven't been to a lot of weddings. Make A List! Sounds silly, but you'll need it. All the things you need to get done, all the groups you need to get shots of. You'll be distracted, especially if you know a lot of people at the wedding.
If things sound rushed, it's because they are. When something important happens, you'll need to fire several shots quickly, be sure you're ready. You don't want to get caught with a slow cycling flash, or a nearly full CF card.
The flash: I went to the wedding with two brand new lithium CR-V3's in my FL50, they lasted for almost 500 shots, flash cycled quickly. Refilled with Nimh AA's, they cycled a lot slower. A diffuser/bouncer like a Lumiquest 80/20 is extremely nice to have.
Backup memory cards? At least four 2 gig cards if you're shooting high jpeg, more for raw. Be nice to have a 4 gig, so you didn't have to change cards so much. I'd suggest you bypass raw, you aren't getting paid and it'll take forever to process that many raw shots if you don't have something to automate the process. PP'ing 1000+ shots without Photoshop's auto feature is a daunting task.
And next time someone asks - charge out the wazoo. It was a lot of hard work to do that wedding, took up about two days of my time.
E3, E1, E330, EP1, EM5
ZD: 7-14, 8FE, PL25 1.4, 14-54, 35-100, 50-200, 70-300 50 Macro, EX-25
MZD: 12-50, 45 1.8, 14-150
Nikkor: 105 1.8, 400 3.5, TC301 teleconverter
FL-50, STF-22