Wow! Thanks everyone. This is a lot of great information, and I'll be working through the photos as I can.
Dave - yes, these are all raw originals. I didn't realize about the .xmp file, so what I've been doing is saving the images I've tried to touch-up as new .psd's and then copies as .jpg's for posting online. I still have copies of all the original nef's, so I can go back and do it properly when I've learnt what I'm doing!
I know CS5 is definitely a little [ok, a lot!
![Smile](https://cdn.cambridgeincolour.com/forums/images/smilies2/smile.png)
] overkill at this point, but as I had it available from work, I figured I would learn how to use it to start, as opposed to buying an additional program and shifting to Photoshop later on. That may have been a mistake, we'll see
Unfortunately the vast majority of the pictures I have of this particular afternoon have this same problem of a near-universal grey sky/ocean.
I do have some other shots which I think are pretty cool, like this fellow. Thanks for all the comments, I will try reading up on this and hopefully return with some progress!
![Post processing cloudy photo's](http://i43.tinypic.com/ei3xcp.jpg)