I've had a few crashes during synching, and I've sent the crash reports to Marketcircle.

Received a message today telling me that I didn't have the latest version of the program.

Evidently there was a newer build, but clicking on the "check for updates" feature doesn't recognize this.

Short of going to the Daylite website on a regular basis, how do I ensure I have the latest version?

To keep an eye on version progress try taking RSS Feed from Marketcircle Blog or using something like Version Tracker which will alert you to new versions of software loaded on your Mac