ok, when it comes to 3d particles there are certain things you can do depending on what you want the particle to look like.. So for instance say you want to use particles to simulate water falling, use a super spray system then, go to your modify tab and go to the load/save presets, go down to load and use the hose preset and then go to the particle type roll out and click on it, then go to the META particle option...(be carefull because useing this particular particle type, and all particles for that matter eat up tons of memory, so make sure you have a good amount of memory and a good processor in your comp) test render it, if you don't like the size of the particles then go to the particle generation tab click on it and go down to size and bump it up.. this is a very cool thing to use.... the outcome is very impressive if you do it right... if you would like a demo video, download one here:
Water.zip I know it doesn't look the most professional, but oh well.(wether you needed this, i still put it up)
Baden Fisher