Help!

thanks to some encouragement from kim, who you can find here and here, and j's generous offer to help me finance for my birthday/christmas this year, i'm seriously contemplating the purchase of this little item (the 15 inch).

my desktop computer at home is a pc (8  years old and still kicking) and i work on a pc at my job.  anyone have this same sort of situation melding the two computer types?

thanks ahead of time.