HL2 runs really well on both my Mac Pro, my friend's Macbook Pro, and pretty well on my brother's MacBook. However on his MacBook, he's running the game from an external drive (firewire) and getting funky "Datacache.dll" crashes... I can't tell if this attributes back to the external drive or if there's something else the game doesn't like. It plays just fine, but then crashes at random times (like when autosaving,... it'll autosave then "auto-crash" ) Is anyone else playing HL2 on a Macbook? I'm thinking about installing it on mine to see if it works there.