First and for most you need to remember the words “Link Building”. One of the most popular ways of building links is by commenting on blogs. This is probably one of the most wide spread methods to help gain inbound links to your site/blog.
Another method that is commonly used is social book marking. It is extremely easy to use and can provide some quick traffic as well as back links.
Also you can try Forum Posting.If some of threads You post in become quite popular they will likely to receive PR juice to your sites/blog them selves. So what will you do is, post in those threads multiple times to increase PR juice passed on to your sites/blogs.