That was a great article guys, and thanks matt, I never thought about using levels to increase contrast.
Incoporating a bit of matts stuff into my workflow I reprocessed two of the shots I did on monday. and I'm reasonably happy, though I think Its not something I'll be using too often.
I think I made this one too dark, though I tried to lighten it using a second adjustment of the curves. I like the way it somehow exaggerated the perspective even more then it already was.

The second one I'm more happy with as it really did just add to it once I made some more adjustments on top of it (extra adjustments to the foreground to bring it back up again without losing the added contrast.)
I guess I can add this to my small collection of photoshop techniques. You learn from others, and I have alot to learn :D