With Google to find what's out there already and virtual tabletop apps, has how you game changed?
A couple of ways, some positive, some negative.
First, since I mainly play with the same people I played with in the 80's (and they are spread all over the country), it's one of the reasons I can game at all. Without Skype and roll20, I probably would be gaming much less frequently. It also has enabled some of the group (who are not as into the "minutia" of the systems we play) to fill out an electronic sheet and let the sheet/software calculate the modifiers and results. We have been able to switch games pretty easily, where before there was always a long learning curve for certain members of the group.
On the down side, as a GM/DM, certain features of online play have shaped our games as well. After using some free or module-based professional maps for combat encounters, the game has become less free-form. Because there is so much extra work creating and setting up tokens, finding maps, etc., the games are more about the characters moving from set-piece to set-piece, rather than exploration or players doing whatever they want. So online games really have created an incentive to railroad as a DM. Likewise, players have become more visual focused. Rather than asking what is in a room (and maybe finding a creative way to use it), they default to what is shown on the map. Combat has become more "boardgamey" and less cinematic (or theater of the mind), and so some of the players have become more centered on tactical abilities for their characters rather than strategic abilities. I'm trying to change this a little (using tools that let me draw maps on the fly and such), but I can definitely see the difference.