Another great little utility recently released by Atomichelix :
'Atomichelix Taskify! for BlackBerry' is a small add-on program that enables the menu item 'Save as Task' in the default mail program. The option appears in both the list screen menu and the view email menu (view the screenshots here) and the created tasks are immediately in the 'To Do' list!
It also worked with SMSs, from my Messages, as well as standard e-mails.
However, with HTML mails only the sender and date were saved within the Task and not the HTML content which is not an issue for me at least.
Both OTA and Desktop installs available from their website : Atomichelix - Product Downloads