I'm also using the 81.87 drivers with a 7800 GTX card. My previous comp used the first generation GeForce 256 card and the 30.82 drivers (or something) so this was quite a change in hardware.
Compared to the 81.85 drivers OFP is now playable again :-), sky/fog problem is gone, but there are some minor issues, e.g.:
* some trees show up occasionally as buildings/towers on Nogova
* server list - that laptop keyboard is shown as an overlay and obscures the list on first entry. Going back and forward to/from the main menu solves it.
* server list, incorrect icon display, all servers show the lock icon for example, though not locked
* multiplayer lobby, all icons are visible and East's flag icon is visible on all players in that player list to the right
