You could also probably try using your UNO to program it...I use my UNO all the time to upload sketches to my multiple home built/standalone arduinos... You'll need the AVRISP sketch on your UNO and then connect the ICSP pins of your standalone chip to the UNOs pins (10,11,12,13) and upload by pressing "upload using programmer" (assuming you've already selected your ATMega version from the boards menu, selected the right serial port, ad have a machine running Arduino 1.01). It'll take a little bit longer to upload the sketch, but it works perfectly for me... Let me know if you need info/help
Cheers!
Mr_E