I've just converted all my accounts (which I've been doing by hand for years) to be in GnuCash. Along with 2 months of receipts (and everything else) it only took 3 and a half hours. I'm really impressed - this has got to be one of the best pieces of Free Software that there is.
Just like Novell/Ximian Evolution (unless your using 1.5) it's a GTK 1.2 app, which means it doesn't look as good (or share libs with other apps) but apart from that - no complaints. Simple, easy to use (once you grasp double-entry), sane - how many other Free apps are that good?