Hi all, I had intended to polish this a bit before releasing it, but there has been some traffic on the mailing list recently about how do to binary IO and this is part of the FastIO library I've been slowly putting together. It's not at all fancy and lacks docs at this point, but people who are familiar with C might find it useful. I originally wrote it because I find myself reading in files containing ints and float a *lot* and going through haskell strings is ridiculously slow. However, it also supports fwrite/fread style binary files (which are of course incompatable across different endiannesses). There is a release with a README telling you how to build it at: http://www.isi.edu/~hdaume/haskell/FastIO.tar.gz It should be pretty self-explanatory; there's even a small test program in there which should make everything very clear. Best, - Hal