You can use syslog to log remotely. However, you might need to install a seperate log server on the logging server - I am not sure if you can actually install two syslog servers in a system.
The other option would be to use a distributed filesystem to log the information. As for NFS, you might actually run into issues if you've got a popular site in terms of hits as you might generate write failures on the log and crashing the software writing to the system. I do not know if that was our particular system though, as we've never tried to log things at the same time from application servers.