CJ, I don't think I've ever posted any tips for this (
nice to be remembered though 
).
Maybe you're thinking of Danny's thread
here, where he posted 3 tutorial links (including the worth100 link). I updated the link to "PixelAddiction" which is where you'll find a very interesting walk-through.
Well, as for some tips....
1) Take time to find a good subject, not every photo is going to lend itself well to the technique;
2) Think it through first. These things usually end up taking a
lot of time - so single out just one good idea instead of trying a bit of everything;
3) Use all the hints possible for the viewer to understand what's going on - perspective, saturation, shadows, blurring etc.....
4) Be your own nitpicker. If you get anything wrong in the 2D/3D/frame physics the viewer
will perceive this and you will immediately lose the effect.
5) and most important...have fun!!
Rô