Ok, reviving an old thread, but thought I would let you all know how it went.
I did it. I had a chat to some people, spoke to him, and decided that I would go with it for old times sake. I also convinced one of the other friends from our group to get back in touch, and they met up, and she decided to go to the wedding too, so that was good.
Anyway, onto being best man. Its fairly simple really. I made sure he turned up at the church, I told him if he did a runner I would be rugby tackling him, I gave the vicar the rings, and I made sure all the required people were in the required photos, and it went fine.
Oh, there was a stag do too. It was a sunday night so was dead, but he works stupid shifts. However, the paintballing before hand went very well

. If you ever go on a stag do, make sure you let the paintballing place know

. Being willingly shot repeatedly by 30 people gave me some speech material

.
And then there was the speech. It went well too. I spent a while sorting it out, and planning it, and had a little show and tell on the go. It also helped that the groom and father of the bride speeches sucked! The groom litterally stood up, said "I don't do speeches, thank you all for coming, over to Des", and the father of the bride did exactly the same, but added in a toast, and handed over to me

.
A little practical gag with a bunch of cards at the start to break the ice, went down great. Thank everyone, tick. Comment on the bride, tick. Then onto the groom. Tell some stories, embarress him a little, talk about how you were good mates, tick.
Hold up tshirt from paintballing completely covered in paint (and a little blood) to demonstraite "no sense no feeling", tick
And following on from
this thread, hold up A3 picture of groom dressed as Posh Spice for a final laugh, sorted!
Propose toast, thank everyone, job done.
Go to reception, get groom trollied so he throws up, check bride doesn't want to kill you (she didn't, I don't think), lead conga line around the whole place, wake up with a stonking hang over.
Complete. Job done.
Thinking about hiring myself out as a professional Best Man
I've not heard from the groom since though, and don't expect to, but I did it for old times sake and it was a great day.