From looking over this thread, i have these impressions:
Maroon 5: they are on MTV. end of story.
Orgy: haven't been good in forever
Mars Volta: Awesome, opening for APC on tour
Glassjaw: Saw w/ Sparta, kinda sucked, but i like their music
Sevendust: Hear their stuff all the time
Alice in Chains: Seriously. and they just jumped on the 'grunge' bandwagon.
Queen, The Who, Pink Floyd: Played every hour on the classic rock stations
Weezer: This may just be because i frequent the weezer boards, but i hear about 'em all the time; Just released DVD and blue album special edition last week
Mine:
Karate--Jazz Rock
The Mountain Goats--Extremely lo fi indie folk rock
Sly & The Family Stone--great band
The Ohio Players--Great funk band
Bands I LIKE that get very little coverage:
Dark Tranquility - Melodic death metal, far superior to In Flames in my opinion.
The Diablo Swing Orchestra - Avante-garde metal is a loose term at best for this fantastic musical ensemble.
Panic Cell - A British hard rock band who've released two cracking albums.
Akercocke - The finest British extreme metal band of the last ten years.
Onslaught - British thrash metal whose last album (Killing Peace) was far superior then Metallica's Death Magnetic and Megadeth's United Abominations.