If you have Fast CGI in use and have errors while uploading files that look like this:
mod_fcgid: HTTP request length 8675309 (so far) exceeds MaxRequestLen (123456), referer: http://somesuchwebsiteandwhatnot.doman
Give the fcgid.conf module in the Apache config a tweak:
Chuck in this (assuming bytes, you this is 32 MB): MaxRequestLen 33554432
Restart Apache and give it a spin.
Looks like the defaults were a bit smaller out of the box.