I think I wrote in other threads, so I probably don't need to repeat myself, but I create web manga and have hosted on several sites. The link is at the bottom of this post.
Doobious- I know several web manga sites but not specific to web comics. So, I don't know if I can help you there since the page layout is different. Plus most of them are in Japanese so you will need to know it. Only a few bothers to read web manga/comics in English in Japan. In addition, manga that's read left to right. It happened to my English version of manga so don't expect too much good results from showing your work in Japanese sites if your manga/comic is in English. I would just stick with US or international sites.
I use
deviantART often for Japanese/English ones. I think it's a good site for posting any sort of art and many MH artists use it. It comes with journal, favorites, and etc. with links you can post in other websites. In addition, you can zoom in and out drawings on your page and etc. People who use it range from tatoo artists, oil painters, photographers, comic/manga artists, CG artists, or people who simply love to draw. It's a good place to know artists from across the globe. There are a lot more sites out there, but I think I like deviantART the best since it's really organized. You can rearrange pages yourself, and some people sell their art works through it. There are occassional contests there, and I once tried out for one that gave you a free copy of nintendo game. I lost but it was a good opportunity to practice pop art for the first time
Oh, and one more. Create a blog or on-line journals then you can host your comic there too. I did that for the first manga and have created valuable blog mates who help me on certain manga topic and random stuff such as which month will the gas prices go up. Or yummy restaurant deals. Just remember that not all readers are interested in reading comics so write about other topics as well. If you aren't sure about which blog site to use, just type in blog in google and pick the one that seems to have most members or on top in the list. If you want to have more readers, visit other people in the blog site or write about current hot topics (films, books, events, games, etc.) that would trigger more people to come to your site. I write at least one entry almost everyday and revise it later. It helps you to find out what to say and not to say to keep your readers interested.
Other than that, I basically write a collection of stupid ideas and random daydreams I have (mainly ahem... food). In addition, never ending everyday happenings that seem to result from my clumsiness:
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Waterdroplet's threads in MH for original manga:
I have several sections devoted to my manga in MH (bilingual/English/Japanese only):
TLOF Chapter 1 (~1.5 years after I first started)
TLOF Chapter 2 (~2 years after I first started)
Project A (Recent ones in Japanese)
Random Manga (really)
Waterdrolet's Gallery