The new EOS Digital Rebel T1i Firmware Version 1.1.1 is available for download at the Canon website.  Please click on the link below:

http://www.usa.canon.com/cusa/support/consumer/eos_slr_camera_systems/eos_digital_slr_cameras/eos_rebel_t1i#DriversAndSoftware

1. Select your Operating System and OS Version from the drop-down boxes, then click on [Firmware]. 
2. Click on the "EOS REBEL T1i / EOS 500D, Firmware Version 1.1.1 [xxxxxxxx]", then click on [I Agree - Begin Download] on the next page.
3. When the download is complete, extract the file and you should now have a "E7KR6111.FIR" file and "update-procedure-pdf" folder.