Disney.com There are a ton of sites but Taylor likes Blast right now [he's bored of Playhouse, but try it too? They have a new clown site with an excellent ABC game] and MY favorite is Kids Island [I could build take-out for hours!].
And, go to google.com and search "kids games" and you will find TONS of them. Just be sure to surf content alone yourself first just in case the site isnt really "kid-appropriate".
We also have Jump Start and Muzzy installed on the computer. Taylor is currently really thrilled with the Muzzy SeaSide CD.
Have you considered a Leap Pad? [Not "My First Leap Pad" but the Leap Pad or Quantum.] It is a laptop looking thing that you put edu-tainment books on and use a pen-mouse to do all sort of cool stuff. It is fasinating!! Taylor [and his cousin, and best friend] has one and spends hours on it if I let him. It is good for the car too which is nice.
Additionally, not to get *too* techy, but do you have a laptop? If you do, you might consider a "remote" modem. ATT [among others] now have a service you can use it at home OR on the road or anywhere. Similar technology to a cell phone. Amazing really.
Good Luck!!