OK, now that I have your attention, here are the details. This was a new one for me, also. Turns out the DNR has posted, at present, 51 different Indiana lake maps online for downloading. All are in a .pdf format which lets you then zoom in for detail. These aren't some cheesy old black and white line maps either. If you look at the sample picture (left), you'll see these are nice, bright yellow contour lines, usually in 5' increments or better, overlayed onto a satellite image of the lake.
The only bad part, which won't be 'bad' if you live or fish the northern half of the state, is that all but 3 of the posted maps are in the natural lakes region. They do have Griffy, Yellowwood and Starve Hollow for us southern folk, though. For more information, visit the following DNR web pages.