Difficulty removing wheels

[R&M Fischer <rmfischer@sk.sympatico.ca>]

Looking for advice...started to get ready for winter so today I took off
the TSW Hock R/Yoko A520's and put the original wheels with snow tires
back on.

I had trouble getting the wheels off, especially the front.  It took a
little WD-40 and some gentle persuation, but they came off OK.  It
almost seems as if the centering rings and the hubs bonded (or
corroded).  

What I am wondering is, is there some sort of grease or potion I should
put on the wheels/hubs/rings so I won't have this problem next time? 
Also, Should I put some sort of grease on the lug threads to prevent
them from seizing?

Ryan
94 90Sq - now ready for winter!