A: 

Does the log viewer have to be written in C#? If not, then i like 'Large Text File Viewer' http://www.swiftgear.com/

Chris
Im happy for it to be written in any language though I would prefer C# cause it would make it easier for me to hack
Sam Saffron
A: 
George Stocker
looks nice for web apps, but not sure how easy it is to fit this for use windows apps ... ideally im looking for a small exe that can consume a bunch of .log files and let me filter through them ...
Sam Saffron
-1. Its a log viewer the questioner is asking for, not error logging.
scope_creep
+2  A: 

Chainsaw is one.

Igor Brejc
there you go subjective again... and you said you don't mind which language it is... -1 for you
Igor Brejc
cahinsaw is written in java not c#
Sam Saffron
A: 

For myself, I use a very lightweight (but 100% flexable solution). I install cygwin and then use:

tail -f LOGFILE | grep SOMETHING

You could also use 'less' in conjunction with grep if you wanted to view the whole file.

Andy
now thats ghetto ... :)
Sam Saffron
A: 

Log2Console http://log2console.codeplex.com is an open source log viewer for Log4Net.

Darrel Miller