KHUM 104.7 - a Triple A outlet that has moved from more classic based to indie/folk to a broad mix of adult alternative, Americana and soul. 100 percent DJ selected.
KSLG 93.1/94.5 - an indie rock/"new sounds" station, always playing a lot of new alt music and breaking new artists.
KWPT 100.3/102.7 - a deep classic hits mix that goes beyond standard classic rock and pop to include vintage soul, new wave and more, with clever features.
KLGE 94.1 - loosely defined as adult standards, but a very deep playlist of standards, jazz, and "lounge" music.
All of the above stations are owned by Lost Coast Communications and serve Humboldt County, California.
KMMT - new music heavy modern and alternative from Mammoth Lakes, CA
KOZT "The Coast" in Fort Bragg is described as "AAA" but deeply rooted in classic album rock. Features Dred Scott, formerly of KFOG and KITS in mornings.
KPIG in the Santa Cruz market broadcasts a broad mix of alt country, folk, comedy and rock at 107 "oink" 5.
95.3 "the Beach" in SLO has an adult hits format that last I listened, had a great classic alternative and hit triple a component, but it doesn't stream out of region so I'm not sure of the current mix.
99.3 KVYN - "the vine" in Napa has always been interesting, and seems to have found a niche as a hot ac/triple a hybrid.
KRSH Santa Rosa - "the Krush" plays a unique variation on AAA based in Americana.
There's also Ted Tucker's deep classic rock station - KCDX, which has often been discussed on these boards.
fans of deep album rock and the classics might also enjoy "the goat" from st cloud, Minnesota - WXYG.
one of my personal favorites - and most eclectic of all the commercial stations in the USA would be KRKQ in Telluride, CO. They broadcast a format called "mountain chill" which incorporates ambient, downtempo, and jazz among many hard to define sounds.
WEQX Manchester, VT - a heritage new music focus alternative station with well done features and a passionate staff. broadcasting from a Victorian home in Manchester to the Capital Region and beyond. my favorite commercial "alt/modern" station in America.
Noncomms are by nature more electic but a couple of note:
KXLL - "excellent radio" in Juneau, AK - a quirky mix of indie rock, pop, and oldies.
KAXE - Grand Rapids, Minnesota - well produced mix of NPR flagship shows with local DJ music and great local color features and interviews.
WXGR (LP) - dover, nh - a worldbeat/chill/eclectic format. mood music and quite unique.
KXRN Laguna Beach - modern and indie music with local specialty shows. probably one of the best branded and promoted LPFM stations I've heard. professional and hyper local while still offering a different musical mix to commercial outlets.