Whether it's for a place to work on the road or just a day-boosting jolt, a good cafe is something to cherish. Beanhunter lets you hunt down cafes across the globe, with an emphasis on independent proprietors rather than Gloria Jeans and the like.
With that idea in place, the site is pretty much what you'd expect, with Google Maps of the relevant locations, and user-submitted reviews for the cafes. Right now the Australian coverage is a little thin (I promise you there are more than 18 independent cafes in the Melbourne CBD), but there's still some good cafes listed.
If your most pressing cafe concern is finding a Wi-Fi connection, check out previously mentioned Laptopfriendlycafes.com.