Here's one about watery spellcasting:
http://www.enworld.org/forum/general-rpg-discussion/191621-ideas-water-spells.html
http://www.enworld.org/forum/general-rpg-discussion/191621-ideas-water-spells.html
Speaking of maritime campaigns, there is a really cool historical resource available for gamers interested in including any kind ship travel, trading, or exploration called a Periplus.
Periplus - Wikipedia, the free encyclopedia
A periplus was a type of navigational document the ancients used in lieux of a map, analagous to the instructions you may have written down on a piece of paper to get to somebodies house in the days before the internet, except with a few more interesting details ... and the fact that these are a couple of thousand years old.
<snip good stuff>
Have fun navigating the demon haunted seas!
G.
Another interesting character who apparently wrote a Periplus which we know of from other writers references to it but no longer have, is this guy:
Pytheas - Wikipedia, the free encyclopedia
...who apparently sailed from Massallia (Marseilles) to England and back in or around the 4th Century BC. He also made it up to the Baltic and back. He is a hero in Marseilles they have a statue of him there.