HI, Real Estate websites and cross linking just happens to be an example given by Google as what not to do, and they have heavily penalized those who do it ... read this post for example.

As for multiple sites (of any type) that come from the same IP address - there is some argument about if this is a problem or not.  If there is a problem, it is more likely to be because of the cross linking than it is because of the sites being on the same IP.  Google especially doesnt like reciprocal link exchanges at the moment.  (But remember that Google et al are black boxes, so no one can know for sure what they like today, and/or what they will like tomorrow)

JK.

You know your website is cool, so why not let your users help you by spreading the word on social networking sites - get the BestWebSites SEO Social Bookmarks Module now from Snowcovered...

To be honest I am not sure exactly how this works now or will change in the future. But I have a single dedicated server and thus only 1 IP. I have a couple dozen DNN installs on the server, some with 1 website and some with up to 20. I use some cross linking by dropping a links html file in my DNN root directories that includes links to my sites and some of my customer's sites. But I do this pretty sparingly. Since the file is in the DNN root, it is accessible via any domain that is on the DNN install and so Gbot can pick it up across many domains.

I have used this approach for over a year now and to be honest it seems to work. I had several sites that I was able to raise from Google PR 0-2 to PR 5-6 in about 5 weeks. I did this all with off-page optimization, which is basically linking. These sites have stayed up there in PR, so it doesn't look like I am being penalized for this.

BTW, does anyone know how to get the PageRank indicator to show up on the new Google Toolbar. I have it on my older PCs, but I installed a new toolbar on a new PC and it does not have the PageRank indicator. Is PR not as important as it used to be?

Hey, I just saw this Web 20 link module in one of the signatures above. http://www.snowcovered.com/snowcovered2/Default.aspx?r=4a419e12a2&tabid=242&PackageID=7186

I am definitely going to check that out. Linking works.

A little off topic, but I personally think that in the future I will only use separate DNN installs for all sites, except in a few circumstances. My original business plan, from several years ago, centered heavily on the use of DNN's multi portal capability, but now I think it is just as easy to just create separate installs for each site, given the fact that my control panel does auto installs. I know that PowerDNN really advocates separate installs, as evidenced by this http://www.powerdnn.com/R3/Support/Papers/DotNetNukeforVerticalSolutionProviders/tabid/166/Default.aspx