Ticket to Ride is now available for the Mac for $9.99 on the Mac App Store. With the ability to play against Mac, PC, Linux and iPad users, it's a pretty great way to get your railroad gaming fix.
Except if you're colour blind. I find the iPhone version basically unplayable at times because I can't tell the difference between different train cars. I wish more developers would add the ability to choose your own colours when playing on devices like the iPhone. It shouldn't matter what colour I choose on my device - the software should be able to figure out which trains belong to who.
Ticket to Ride is also available for the iPhone (called Ticket to Ride Pocket - $1.99) and iPad ($6.99).