Beyond Compare is a good tool, but not free.  It's like $20, but does 
all of the things you want.  There is a 30 day free trial available.

http://www.scootersoftware.com/

JP

Christopher Cole wrote:
> On Mon, Dec 18, 2006 at 09:15:40AM -0600, Mike Hord wrote:
>   
>> Does anyone know a good free file compare utility for ASCII files?
>>     
>
> Diff.  http://en.wikipedia.org/wiki/Diff
>
>   
>> The feature that I really need is a specifiable comment character-
>> i.e., "lines that start with ' should be excluded from comparison
>> until a new line is reached".
>>     
>
> Grep.  http://en.wikipedia.org/wiki/Grep
>
> Both tools available in any reputable Linux distribution.  On Windows, use
> cygwin.  Also check out http://unxutils.sourceforge.net/
>
> Take care,
> -Chris
>
>   

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