The lightweight Sparrow Framework, the iOS game engine which I used in the balloon iPhone game programming tutorial has added a particle system.
The particle system can be used to create particle effects like smoke, explosions, and fire easily and can utilize the previously mentioned Particle Designer tool (you can of course code things yourself). The Sparrow Framework developers were able to do this without bulking up the size of the engine by adding the particle system as an extension rather than including it within the Sparrow Framework code.
You can find out how to download, install, and use the particle system on the wiki page here:
http://wiki.sparrow-framework.org/extensions/sxparticlesystem
Played around with a little, and it is very easy to use looks like a great addition to the framework.
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