Pressure to constantly publish new work?

IPBiz had to re-post this description of "college professor jobs" from finance.yahoo:

3. College Professor

Median salary (experienced): $70,400
Top pay: $115,000
Job growth (10-year forecast): 23%
Sector: Education

What they do: Teach and grade papers, of course. But profs also spend about half their time doing research and writing articles and books about their field.

Why it's great: For starters, major scheduling freedom. "Besides teaching and office hours, I get to decide where, when, and how I get my work done," says Daniel Beckman, a biology professor at Missouri State University. And that doesn't even take into account ample time off for holidays and a reduced workload in the summer. Competition for tenuretrack positions at four-year institutions is intense, but you'll find lots of available positions at community colleges and professional programs, where you can enter the professoriate as an adjunct faculty member or non-tenuretrack instructor without a doctorate degree. That's particularly true during economic downturns, when laid-off workers often head back to school for additional training. More valuable perks: reduced or free tuition for family members and free access to college gyms and libraries.

Drawbacks: Low starting pay and a big 50% salary gap between faculty at universities and community colleges. If the position is at a four-year university, you'll probably have to relocate, and you'll be under pressure to constantly publish new work to sustain career momentum.

How to get it: For a tenure track position, you'll need a Ph.D. But all colleges want at least a master's degree and prefer plenty of teaching experience.

Looking at legal publications in "patent reform," one might infer there has been pressure to re-publish old work.