On the other hand, SIGGRAPH (the graphics SIG of ACM) has an excellent style file, which often shows up in computational geometry proceeedings. I guess it's no surprise that the graphics folks are more sensitive to the layout and presentation of a paper.
Obviously, these are subjective judgements. So judge for yourself:
- SIGGRAPH-style example PDF file.
- ACM Proceedings-style example PDF file. (this is the "alternate" style; the standard one has essentially the same look)