I just did the following on a Vista Yuma before I upgraded to Windows 7. Use diskpart from the command prompt to make the restore partition visible. Copy/Burn/Backup all the contents on the partion for future use. Remove the partion using disk management then combine the c: drive with the unallocated disk space using Easeus Partition Manager (free).
Follow this:
uncoveryourrecoverypartition.blogspot.com/
Use this:
www.partition-tool.com/personal.htm
You will gain 4.4GB of disk space. Trimble should have just supplied everyone with restore disks so we could have more disk space.
THIS WILL PROBABLY VOID YOUR WARRANTY. USE AT OWN RISK.
(it's worth it!!)