This place crawls compared to what it used too.
Pity too...
Some suggestions:
Open up more of the private area... that will attract people.
Actually get the IRC channel back up and invite people.
Create a tutorials database (downloadable).
Create a software index.
Put some catchy words and configure a robots.txt file.
Update IPB or move away to something more developed as this version is heavily outdated. Thus huge security holes.
Create a custom individual skin that doesn't make the forum look generic.
After all this ask your members nicely to help increase traffic here by putting a button in their signature on other forums.
Link exchange with a few more sites.
Open up some art competitions etc.
Just a "small" list of suggestions.