While not as good looking as Water Slide Decals, there are still quite a number of good reasons to use Dry Transfer Decals. You might not have the equivalent in Water Slide form is a good example.
Applying a Dry Transfer Decal is very easy. Remember back in school when they had those letters that could be rubbed on to things? Oh, it was just me then!
Well anyway, it's exactly the same thing and I'll demonstrate an easy way to add Dry Transfers to your model kit
Text version with pics can be found here : http://www.ghostofzeon.com/diy/drytrans/dry.html