I'm not sure about match of the decade, as after all this is a repeat of the final of two years ago, and it could be argued that United are significantly weaker than then. Also I feel that Barcelona are significantly bigger favourites than United were the last time around (when, lest we forget, they were completely outplayed for almost the entire match).
Still, a big game none the less, and one I am expecting to be surprisingly close. There is no doubt that Barce are the stronger side, but United are pretty good at upsetting the rhythm of other teams, and may be able to slow the game down and make it difficult for them to flow.
Which means it will come down to whether Messi can still influence the game without his usual supply line... frankly he could beat any team in the world almost single handedly if on form, so its quite possible he will make the difference, but I have a nagging feeling that United will steal this somehow.
Also there is discussion taking place in the NGFC club should anyone be interested in talking with more like minded football fans (as lets face it, it is only a matter of time before the football haters show their faces in here).