I know this is old, but since it's been bumped already, maybe help for next year....
If you have more than a few thousand in total income for the year, I'd talk to an accountant. A 1099 sounds like they're reporting it to the IRS, so you'll probably want to report it on your taxes. I'm not an accountant, but AFAIK the $600 limit is usually the payer not having to report it to the IRS, not that you don't have to report the income...
Lets say you have really diversified income, and 100 places pay you $599 each. If the IRS gets wind of you making ~60k a year, I would almost guarantee they're going to want their cut...