My favourite screenshot application and the one that I swear by is available in V3.01.
Screenshot for Symbian OS is an application to take screenshot on your Symbian OS mobile phones (S60 3rd). You can capture screenshot and save it to a file in JPEG, PNG, BMP or MBM format. The screenshot can be sent directly to a PC via Bluetooth.
Thanks to AntonyPranata for updating it. This version (from the horses mouth) is better because?:
The current official version (2.80) does not capture N-Gage games properly.
The new version (3.01) has fixed this problem; but the signed version is not available yet.
You can download it here but it is unsigned, which means you will have to sign it yourself or wait for a signed version to be released.