An interesting application which can be installed via the 'Application Manager' using the necessary repositories is the 'MH Shot Tool', a screenshot application with an integrated Flickr upload facility !

Step 1 : take screenshot using MH Shot Tool
Step 2 : save screenshot locally or upload it to Flickr

Screenshot of upload screen:

Screenshot of partly Flickr webpage:

In case a 'delayed screenshot' is necessary, then it's better to use the screenshot facility of the CPU/MEM/Screenshot applet. However it's only available for OS2006, it's perfectly installable on the OS2007.