Way 1- Get a plug n plug it into the computer, put all the memory onto a computer... unplug it then put in the other sim card n plug it into the computer n take all that memory u just put on the...
If what you want to do is export your SIM contact list to your computer, then here is a tutorial http://www.entreeweb.com/software/how-to-download-your-sim-or-ruim-contact-list-to-your-computer/
Try Copying data of the SIM card to the Computer by an Other handset then Sync the Contacts via Ms Outlook, or Windows Address Book,.
-it worked for me Though