If you are looking for something simple for one car check out this:

http://www.rcraceday.com/sites/rcrd/other.asp

or if you send me your email address I will email you a .zip file of an Alpha (pre-pre-release) version of a windows timing app I am making that will be for sale soon (you can have this version for free). It uses the 1-0 keys to count the cars as they pass. Up to ten drivers. You have to promise to give me feedback and tell me how you are using it. Runs on win 98 SE or higher with the .net framework installed. This version handles single races, not series and reporting is disabled.

Let me know,

[email protected]
http://www.rcraceday.com