OK, thanks for the info, I looked into the mod_rewrite thingie, I think I'll need that anyway to 'convert' the ol d site's bookmarked links to the new one.
And indeed I didn't think about similar systems such as messageboards, I'll think that will work.
However, I am still somwhat worried about the seperate files.
If they are found (any way whatsoever) they will stumble upon a white page with notjhing but text.
Correct me if I'm wrong:
pages cannot be found when placed in a seperate directory and aren't linked to from anywhere.
(I hope so, because that's how my admin folder is stored...)