Cowork, Work Spaces, Forums

Non-traditional working arrangements like co-work have appeared on radar lately.
http://en.wikipedia.org/wiki/Coworking
http://www.xconomy.com/boston/resources/technology-co-working-spaces/
http://bostinno.streetwise.co/all-series/accelerator-programs-and-coworking-spaces-in-boston/

They are related to semi-traditional incubators somewhat like the Cambridge Innovation Center
http://cic.us/

Given interest in a specific domain like renewables and sustainability, something like Greentown Labs arises.
http://greentownlabs.org/

And newer (physical) hacker spaces
http://en.wikipedia.org/wiki/Hackerspace
http://hackerspaces.org/wiki/
http://artisansasylum.com/
and meetups.
http://makerfaire.com/
also appear.

There are also related forums where new business ideas get discussed
http://www.mitforumcambridge.org/
http://en.wikipedia.org/wiki/TED_(conference)
http://www.ted.com/

One of my friends mentioned in passing (and in confidence regarding any specific details/anecdotes) that it is sometimes the case that certain points of presence are more a liability than an asset (financially and legally). This must be carefully considered.