I would love to get in to modding - are there any tutorials anywhere ?

Yup We have loads of geat tutorials for mapping and modding for a wide range of games. You can find them here

ToBMike writes...I think you need to clarify your question a bit since modding is a broad term.

thanks foyleman - didn't revert me to the tuts like so many normally do (inc welshy lol)

What i meant was modding - making a mod like OpenWarefare / K3 / eXtreme+ / AWE etc etc etc

that would be Call of Duty 4 modding with a focus on c-style scripting

I can't really answer regarding the CoD series specifically.

However with Quake 4, much of the modding can be done without learning C style programming, although a background in it does really help. You can learn a ton by looking at existing mods and comparing the provided files with what was released with the SDK and see how the made the changes to the game. I go over a bunch of these mods and how briefly how you can learn to make them in my Quake Mods for Dummies book.

Half-Life 2 on the other hand has an awesome SDK wiki site. You will need to learn C style programming, but there is a ton of help to reach your objective on the wiki and a few good forums. Sadly, I didn't have enough pages left to include my chapters on modding that game in Half-Life Mods for Dummies. :/

I mention these two games since I have the most experience in them. I'm really not trying to just promote my books... it's just a resource I have created upon my experiences so it's easy to use those as examples. You may find that similar resources or methods of discovering how to mod within the CoD forums, SDK and already released mods.

I would consider starting my looking at mods that are already created and garner ideas from that released code. With CoD 4, you might be able to do that. Compare the original files with the new files and figure out what they did.

I hope this helps.