advice for syslog server

[FM <dist-list () LEXUM UMontreal CA>]

Hello,
We are using PIX firewall and I gonna configure an external syslog server.

What do you use to do some automatic log checking ? For example, today a 
external user  downloaded several GB. We saw it on our stats. I cannot 
look my stats website erveryday for every we server.

So do you know good syslog parser/manager ?

Thanks !