I am seriously looking at buying a flash unit - the Pentax AF360FGZ but before I lay down my cold hard cash, I just wanted to be sure it will be of benefit to my photography, and not sit collecting dust.
Now I am not really interested in portraiture, but I am certainly interested in macro work, and the benefit in bird photography was clearly pointed out to me the other day.
Other than these fields, I just don't know if a flash would be of benefit otherwise - please enlighten me

Thanks.