If you happen to want some kind of speed up, the de-facto standard these days is JiffyDos, and the best place to get it is from Jim Brain's store
And, if you want a mass storage device, take a peek at the uIEC/SD card on that site too. Sure beats using floppies!
You can put all of the .d64 files you're creating on an SD card, pop it in the uIEC, and using JiffyDos, basically CD (change directory) right into a .D64.
My favorite game houses: Broderbund and Synapse.