New School of Music
Susan Lincoln's new CD Creative Presence
Chris Smither
Craig Toungate
David Goodrich
Finland Steam Baths
Hilde Girls
Inner Arts Institute
Jess Tardy
Noam Weinstein
Peter Mulvey
Planet Records
Rick Berlin
Steve Sadler

...for singers...

Susan Lincoln
Her CD Mother Heart will heal what ails you.
Before the Music Dies - DVD
Cello Drones
for improvisation, intonation, meditation, relaxation... recommended! also available on iTunes
Clarion - ear training software (Mac)
Earplane - online ear training
Metronome Online
haven't tried it, but if you don't have Garageband (for Mac), it could be good
Musical EdVentures
MusicTime Deluxe - notation software (Mac and PC)
user-friendly, affordable
Open Mics in Boston
list at bottom of the page

... books for singers ...

Alfred's Essentials of Music Theory Complete (Books 1-3) (Spiral-bound)
Rock N Roll Singers Survival Manual by Mark Baxter
Edly's Music Theory for Practical People

... piano stuff ...

Apronus online piano
Flash Music Games
Go Piano - online 12-tone keyboard
Nora the Cat plays piano