vim hackers?

I was hacking away this afternoon and going through my usual cycle of 
vi file, "huh, what's that?", ^Z, bk revtool file, double click last 
node, find the line, "oh, yeah, I added that in '98, I remember now",
ctlr-q, fg, hack some more.

and I was wondering if any has coaxed vim into letting you edit a file
that has annotations.  I'd love to always be looking at the files with
full BK history behind them and be able to use that.

I think vim has some sort of column folding that is sort like what I 
want, has anyone played with it?

Thanks,

--lm