On VHF and UHF. Depends on area, but there are at least as many digital repeaters as analog on VHF/UHF where I live and hotspots are also popular.

Interesting! I had no idea, they are all NFM around here.

Hotspots really help with that. Even if there are no repeaters near you a cheap hotspot will let you hop on digital and talk to people all around the world with minimal fuss. People complain that it's not "real" amateur radio, but if you just want to talk it's very accessible.

Everywhere. There is a big DMR network here in Kansas City, and Fusion too.

http://c5.byrg.net/WP_BYRG_WWW/byrg-repeaters/

http://www.kansascityroom.com/Repeaters/