Like adbot said, it's impossible to value it without knowing what it's about, the niche etc. Considering the age and that it's only a PR2, you'd have to guess that it's not that popular. Personally I'd try building some links, try and increase that PR2 to 5-8 (the age would help this) and then get someone to value it.
The value now - some people might pay 4 figures for it, but I don't think it would get any higher considering the page rank.