If you like to live on the edge, this is the place to grab the latest checksum betas, if any are available.
If you want to know what's changed since you last upgraded, see here.
Note: .. The checksum_x64_Reg-Free-Special-Build* is just a bare-bones checksum.exe with all the registration malarkey ripped out. This needs more testing. If you are having difficulties getting checksum registered, drop in this replacement binary.