Links on first post (or first couple if you're being slick) to your own site: If it's a competing website, not okay. If it's say.. a blog entry you're referring to, or... you're a developer and want to link to your site when you announce an app, that's alright. Bottom line - Don't come here to pimp your site – come here to be a member.
Links to your own site, in general: Toss 'em in your signature, that's fine. Linking when referencing something relevant and stuff is fine too. Just be a contributing member, not a spammer.
In regards to all of this.. Moderators will handle situations at their discretion – using this thread as a starting point. If you have a problem with a member or a post here, report it. Mods will see it. If you have a problem with a moderators actions or how they handle a situation, feel free to PM or email me. phases at phandroid dot com. Not happy with my decision? Hit up Rob. There's a link at the bottom of the site, "View Forum Leaders" - you can find ways to contact him there.