You can look at the cap situation of all of the various teams here:
http://spreadsheets.google.com/pub?key=r0EIACYJtq4Wgjl-ZmYzRug&gid=1The teams over the tax are:
Boston (approx $14.1 million)
Cleveland ($12.2 million)
Dallas ($15.6 million)
Denver ($5.3 million)
Houston ($3.0 million)
LA Lakers ($21.4 million)
Miami ($2.8 million)
New Orleans ($572k)
New York ($13.7 million)
Orlando ($12.1 million)
Phoenix ($5 million)
San Antonio ($10.0 million)
Utah ($4.4 million)
Washington ($9.0 million)
There aren't too many teams within striking distance of getting under the tax, but I could see Phoenix, Utah, and Washington wanting to cut salary, and potentially Houston and Denver, too (in addition to the teams named by wdleehi).