Things I suck at... funny this thread came up because a lady I was with last week asked me the same question... her issue was sense of direction.
So, here's a short list:
1) Absolutely atrocious hand-writing - my admin ranks me worst in my office. Thank god for computer keyboards and blackberry's, which means no one else really needs to be subjected to my hand writing any more.
2) I'm a slob, don't clean up after myself, although I have gotten a little better over the years. In this category as well, I have certain shirts that I own that no matter what I am doing, I will spill something on them. But only with certain shirts, and it feels like every time I wear them I have to change them.
3) I procrastinate over tasks I find onerous. I've never done my taxes on time. At one point I was 4 years behind, and got a huge pay check in owed money back from the government when I finally straightened it out. All my bills are on auto-pay for this reason, which is why I still have good credit!
I find it funny how having kids has impacted #2 & #3 for the better. You just have to get shit done and picked up when you have small children. It forces me to clean up and not procrastinate over stuff for them. There's no hope for #1, I should have been a doctor writing prescriptions.