The FCC released its latest report on broadband penetration (incidentally right on the heels of the EU's Review). While these broadband reports have been criticized, and the FCC will be adopting new reporting technologies (see this summary over at CNET), the data on technology use are still interesting and useful.
I have culled this graphic from Table 3 of this report. Plotting it in on a semi-log scale highlights the fastest growing technologies in addition to the ones in greatest use. You can see that, while cable modems are the dominant technology, followed closely by ADSL, the most rapid growth is in fiber and wireless. This should surprise no one, but it is interesting to see it graphically.