You can submit here manually for free to tons of web 2 sites. If you are interested in automated batch submission take a look at the offering for Internet Marketers. The sites often change their submission forms so it is possible an iMacro stops working, but given all of them are open source you can submit a fix if one of them would stop working due to the site updating its forms. You will receive 1 month free batch submission for each fix you submit.
You can add a site to our supported services here. If you have a favorite site, or you are a site owner or webmaster ShareMacro can drive you lots of new users and content. Please note we dont tolerate spammers, so you can rest assured regarding the intent of our users.