I loved doing the thank you cards!! I just felt that everyone had gone out of their way to attend our wedding and gave us lovely gifts (no registry, so it required effort to choose) and made our wedding really wonderful, I couldn't wait to write the cards.
Not really wedding exactly - but I'm finding organising the photographs after the wedding really tedious. I've scrolled through our entire collection of 700+ wedding photos about a kazillion times now to copy different selections onto CDs for each family / friend group and make 6 photo albums for family, and I am SO SICK of looking at our photos! They're great photos, but one does get tired of looking at the entire photo collection 30 times in one evening.
If I weren't so skint I'd totally outsource that job.