Publishing your material online has also proved successful, in the past, for wooing publishers.
Some examples are Jame Melzer's The Zombie Chronicles (to be released as a print novel through Pocket Books in 2010) and John Dies at The End by David Wong (recently released by indie publisher, Permuted Press, before being picked up by a major).
Of course, comic-book work lends itself, even easier, to online publication.
If you need a good website developer, at good rates, I'd be happy to recommend the chap who did my website (see signature).