I have always thought of forum posting as beneficial to the
community it's niched in, beneficial to me as a knowledge
base, and now more so than ever (and we can see this by the
increase of spam on our forums) it's a great place to market
your sites.
And one great way to make sure your posts become the "hot topic"
amoung the many other great threads you'll find is the creative
use of link baiting your thread titles.
For example, I recently wrote a thread post titled, "
Some Say,
'Forget Google!'" - and as you know with the tidal wave that they
have created lately with site penalties (PR drops) - people
want to express their very passionate opinions on those types
of threads. So it's a good way to make sure your posts generate
allot of interest.