Well, since I disabled the metacrawler (see earlier posting), I haven't had any battery issues (save the one with the particular router, posted about it yesterday), so at this stage I'm somewhat inclined to blame the crawler for those times when I was out of battery in the morning.
I'm also wary of installing Canola or any other software which also uses file system crawlers. I don't like file system crawlers and I don't even think they serve any useful purpose.