Memory map on a Netbook or pda and a bluetooth or USB Gps dongle
The thing about MM is it's ease of use and portability, not to mention sharing routes and tracks, etc with other MM users. I use it on my lappy, PC and on my Dell PDA with BT GPS mouse.
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I got the same sort of set up, but a HP Ipaq and a tomtom bluetooth GPS.
I had ipaq with built in GPS but found the screen too small and difficult to see in certain light conditions. So invested in an Asus netbook and usb GPS and it's a huge improvement.