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/Peo, FreeWebSpace.net
PR is the things that you need to consider if you have well optimised your site, else it wont really help much in your ranking. Both keyword density and the distribution are important. It is advisable for you to understand various techniques that your competitors used (it might not be obvious)...
There are lots of sites that provide free image hosting (for example http://www.imageshack.us), so i believe you dont really need them to host your signature.
I am using everyone.net , it works great for me.
Basically what murat meant is to provide free email service to his visitor but using his domain name i the email accounts. For example, if your site is www.mydomain.com then you can offer your members free email account membername@mydomain.com...
if you really want a CPM, you might need to just sell the advertisement space yourself. Coz normally affliate programs only give per sales or per lead, and ad network like adsense pay per click.
something like nomorehits.com , i used that before, got more than 50 downlines. Is manual, but normally ppl wont borther to look at the site also, dont even mention click on anything inside.