When working remotely from the product stakeholders, its important to be able to iterate rapidly over designs, and to capture evidence of, and reproduce tricky bugs.
A great way to do this is by sharing screenshots, and the best tool for quickly sharing screenshots on Mac is GrabUp.
The tool is implemented as a Preference Pane and monitors for screenshots. When a screenshot is taken (using ⌘ ⇧ 3 for full-screen screenshots, ⌘ ⇧ 4 for regional screenshots, and ⌘ ⇧ 4, space for single-window screenshots) the image is automatically uploaded either to GrabUp’s servers, or to your own FTP server*, and the URL to access the image is placed on your system’s clipboard for pasting.
The free version of GrabUp provides a URL which looks like a PNG, but is actually an ordinary web-page containing your image. Pasting these links in Campfire leaves empty rows, so either upgrade to the Pro version which doesn’t have this problem, or remove the “http://” from the beginning of the link before you send it.