Well, I'm a project manager for the media section of a text-book publisher. It's the project management that I am bad at, so I'm going to find a job where project management isn't the primary job skill. I like computers and media and education, so I may stay in this industry, but move into a position that's more about problem-solving or working directly with content (more editor-y or programmer-y). Something that would let me work at my own pace more.
Sales is a great place for people with ADD as they are often personable and funny (perhaps I'm projecting ;) ). Attention and follow-through, and detail-oriented work are part of any job, but there are some that are "better" than others for people with ADD. Like, if you're good at sales or writing, or whatever, you can often hire an assistant to handle the attention-heavy stuff. ADD types often do well in creative fields, too, as the "creative" thought process seems to be similar to the ADD thought process. So much so, in fact, that a recent study has shown that ADD drugs can eliminate people's ability to have "AHA!" insights when trying to solve puzzles. This has been documented by researchers and I can personally report it's true for me.