I'm wondering what effect the following would have on page rank and traffic. I have a url with landing page http://url.com, a blog under http://url.com/blog and a forum http://url.com/forum If I also added a directory to the site (eg. http://url.com/directory) what effect would this have on overall page rank and traffic for the site as a whole? Would it do anything at all??
Well, if URL.com is your domain, you're sitting in high cotton. I assume though that URL.com is not your domain and you are just using it as an example domain. That said, it's very tough to estimate what effect a single folder is going to have on your PR. Traffic-wise, an additional folder is probably not going to make any sort of difference. Most likely it won't make a difference in your PR either unless it is laser targeted on your niche and is designed as an "authority" type of page / section. Even then, it's going to take time for the SE's to notice and reward you for this. So, the short answer is "nothing".
Page rank is 100% determined by incoming links to your page. Number of pages or content have zero direct affect (although good content can increase the chances people will want to link to your site) - so it would have no affect on PR. Adding a blog and forum is no guarantee that it will get any traffic. The directory is the least likely to increase traffic imo.
Your page rank will not get diluted at all. You can add directory, directory 1 .... folders and if you have sufficient back links then they shall also get pr in next PR update.
Yes it won't make any effect on the page rank. I certainly doubt how much traffic you will get from the forum and blog as it is very challenging to run a quality bog and forum. Even the existing forums are under the viral effect of members leaving it for no reasons.
pr is not related to traffic, but if u have good revelant incomming links your serps and traffic will increase.
I guess it wont have any effect on traffic. Rather it would be better to build reputation of your website.
if your site can be found in the search engines then peaple will find your site and the go on it, = you get more traffic
If you have incoming links from GOOD sites with GOOD PR then there is a GOOD chance that your PR will increase.