Haddon's Music and/or Sound Designs have been heard at the following venues and/or companies*
Ablaze Theater Initiative (Boston, MA)
Altoona Community Theater (Altoona, PA)
American Repertory Theater (Cambridge, MA)
Arizona Repertory Theater (Tucson, AZ)
Athenry Theater Co. (Athenry, IRELAND)
Athlone Theater Company (Athlone, IRELAND)
Baytown Little Theater (Baytown, TX)
Boston Playwrights Theater (Boston, MA)
Belfast Maskers (Belfast, ME)
Boston Theatre Works (Boston, MA)
Coyote Theater (Boston, MA)
Gloucester Stage Co. (Gloucester, MA)
Irish Arts Theater (New York City)
Kopper Bear Productions (Waukesha, WI)
Lakeview High School Theater (Battle Creek, MI)
Lyric West Theater (Wellesley, MA)
META Theater (Tucson, AZ)
The Naples Players (Naples, FL)
New Repertory Theater (Watertown, MA)
NYC Fringe Festival (New York City)
Off 380 Players (Wise County, TX)
Packer Collegiate Institute Theater (Brooklyn, NY)
People's Improv Theater (New York City)
Piti Theater Company (New York City)
Publick Theatre (Boston, MA)
Queensize Productions (Sydney, AUSTRALIA)
Samuel Beckett Theater (New York City)  
Seattle Fringe Festival (Seattle, WA)
Speakeasy Stage Co. (Boston, MA)
Stage 212 (La Salle, IL)
St. Norbert College Theater (De Pere, WI)
Suffolk University Theater (Boston, MA)
The Sugan Theatre Company (Boston, MA)
Tri-State Actors Theater (Sussex, NJ)
Underground Railway Theater (Boston, MA)
Union Theological Seminary (New York City)
UNLV Theater (Las Vegas, NV)
University of Maine Theater (Portland, ME)
University of Wisconsin Theater (Richalnd, WI)
Vokes Players (Saugus, CA)
Wellfleet Harbor Actor's Theater (Wellfleet, MA)
Winnipesaukee Playhouse (Laconia, NH)
Whole Arts Theater (Kalamazoo, WI)
*not all companies have websites

Friends and Collaborators
Richard Chambers - Set Designer
Topher Cox - Photographer
Yamil Suarez - Web Designer
Nicky Sanders - Violinist/Songwriter
Era 404 - AMAZING Graphic Design
Popstick - Flash design and so much more

Arts Industry Organizations
National Endowment for the Arts
ProductionHUB.com - guide, directory and jobs for film and video
Stage Source
Atlanta Coalition of Performing Arts
Larry Stark's Theater Mirror

Technology
Potion Factory - Insanely good podcast software
Music Technology Dictionary
Apple Computers
Macintouch
Mark of the Unicorn
Webopedia

Fun
Fark.com
Other Crap
The Daily Show
The Colbert Report