After the initial connection using the USB-to-Treo cable and setting up a partnership with the phone, I was able to dock using the cradle. I don't know if this will help anyone else; here is some additional info: Phone: Model: Palm Treo ...
Source: discussion.treocentral.com

Palm Treo 750 for Cingular launching at CES
We can't yet say for certain when Cingular will actually be selling the Treo 750, but they do like announcing new devices at CES (or not so new devices, as it were), and it looks like the US launch of the 750 is due this Sunday. ...
Source: www.engadget.com

Dial By Photo
Dial By Photo is available as a free trial and it is compatible with the Palm Treo 680, Treo 700p and Treo 650. To support the announcement, the developer is offering the application at $11.95 through February 12th, a savings of $3. ...
Source: blog.everythingtreo.com