I'm gonna second PAW's suggestion and recommend that you get a JP1 compatible OFA remote. To control X10 with any infrared remote control, you need to first get yourself an IR543 box, which can be had for $20 from http://www.homeautomationnet.com

So, here's an example of your total outlay for a new remote setup:

1) Get an IR543 for $20 (plus $7 shipping) from http://www.homeautomationnet.com
2) Then get a URC-8811 (8 device learning remote) for $19 and a JP1 cable for $15 from me, plus $4 shipping

Grand total: $65

For that you will be able to control your X10 stuff with this and most other infrared remote controls, plus you'll have a remote that you can program from your PC using JP1, which means you can make it control just about anything.

You can read up on JP1 here:
[Link: hifi-remote.com]