I filed back in 2007 based on a draft K-1. Obviously, I have since received the final and not done anything with it, because even I could tell it was just going to happen again in 2008 and I figured I might as well do the amending for 2 years at once. Here's hoping I didn't miss some you-must-amend-by rule.
Of course, that means that I have 2 years worth of amendments to do, along with this years taxes. Fortunately, the paperwork for this year won't really have hit critical mass for at least, gosh, another week or so.
In the meantime, lots, and lots, and lots of filing to catch up on. Oh, and purging. Because there in things in that filing cabinet that don't belong there any more.