I would also like to know if this is possible. Same goes for SMS and MMS messages.
I dont know about the call logs but with SMS/MMS all you hafta do is highlight the date and click the menu button and then select delete prior...this will erase all messages. So for example if you got a message today and wanna erase all the messages from today on you just highlight Tues Dec 30, 2008 and hit the bb menu button and hit delete prior
alright to delete the call logs you do the same thing but you go to your message folder then click menu then click view folder then click phone call logs and highlight the date again and click the menu button and delete prior