The best way to post more pictures to Flickr is to simply ensure that you camera is involved in your life. Take it everywhere you go, snap some pictures and come back and submit to Flickr using any one of the various Flickr upload tools (like Flickr Uploadr for Windows).

Another great way is to moblog by setting up a blog in Flickr so that when you email images to Flickr they are automagically posted on your blog. It is great and a lot of fun!