I recently wrote about graphing heap profiles, and now it's easier to try out my work-in-progress hp2ps rewrite as I uploaded hp2pretty version 0.1 to Hackage. Currently it has no options and works as a filter from heap profiles to scalable vector graphics, for example:
hp2pretty <in.hp >out.svg
Some rough benchmarks on a huge (37MB) .hp file give almost identical timings for hp2pretty and hp2ps, though hp2pretty does use more memory. I haven't yet benchmarked the more common case of small .hp files.