important errors to control with swatch

Hello,
I just installed swatch, and used this configuration file for the
checks:
http://www.loganalysis.org/sections/signatures/log-swatch-skendrick.txt

Anyone knows any other common phrase or word that I should find the logs
for hardware and system errors?
Or what you consider important to monitor in the logs?
Thanks

-- 
Isaac Perez Moncho 
GSEC, SSP-GHD, SSP-MPA, SSP-CNSA Microsoft MCP.
JPL TSolucio S.L
www.tsolucio.com