I'm a big fan of Ian's stuff, too. When I first heard JT it was so different I didn't know what I was hearing. I quickly grew to appreciate that same originality, though.Jethro Tull
How about a few underrated albums.
Second Helping
Fool for the City
Sailin Shoes (a classic)
Searching for a Rainbow
Wind and Wuthering
The Smoker you Drink the Player you Get
Presence
Live at Leeds
I'd say my favorite overall would have to be Dave Matthews and Tim Reynolds (Like the "Live at Radio City" blu-ray). I don't know what it is, but when I listen to that music I can actually feel it, like in my gut or something.
Outside of that,
Dave Matthews Band
Jack Johnson
John Mayer (after "Body is a Wonderland")
String Cheese Incident
Widespread Panic
Days of the New/Tantric
Alice in Chains (esp. the "Unplugged" album)
Tool
Along with several others. Both new and old, these are just the ones I listen to most.
You need to check out Black Country Communion with Joe Bonamassa (perhaps the greatest yet least known blues guitarist since Slow Hand), Glenn Hughes (of Deep Purple and Black Sabbath), Jason Bonham (Johns son), and Derek Sherinian (Dream theater keyboardist)