I've tried that thing a few times and it just spits out crap. What sort of figures is it giving you?

I ran my numbers through it again and this is what I got -

Fits: The Competitive Fit / The Eddy Fit / The French Fit
Seat tube range c-c : 60.3 - 60.8 / 61.5 - 62.0 / 63.2 - 63.7
Seat tube range c-t : 62.1 - 62.6 / 63.3 - 63.8 / 65.0 - 65.5
Top tube length : 60.0 - 60.4 / 60.0 - 60.4 / 61.2 - 61.6
Stem Length : 12.9 - 13.5 / 11.8 - 12.4 / 12.0 - 12.6
BB-Saddle Position : 84.8 - 86.8 / 84.0 - 86.0 / 82.3 - 84.3
Saddle-Handlebar : 61.2 - 61.8 / 62.0 - 62.6 / 63.7 - 64.3
Saddle Setback : 7.3 - 7.7 / 8.5 - 8.9 / 8.0 - 8.4
Seatpost Type : NON-SETBACK / SETBACK / SETBACK

Inseam 93
Trunk 64.5
Forearm 39
Arm 84
Thigh 64.5
Lower Leg 60
Sternal Notch 155.5

Funny as it sounds, it's not far off what I have. My top tube is 60.5, saddle setback is 80, stem is a 120, BB to saddle is 82 ( but I run 177.5 cranks ).

They must've improved it the last time I used it. As with most things, I reckon you should do as many of these things as possible. I researched for about 4 months before going to get fit up by John Kennedy. His numbers and my numbers were insanely close.
The thing to watch out for with these online fit things, is that they do not take into account flexibility, nor do they account for where you plan on going with your cycling. They're a good start though. My advise is do as many of these things as you can, and see fit as an evolving thing. getting fit up by a pro is well worth it I reckon.