Ski/Snowboard Tuning

[Sliver]

So I'm pretty good about waxing my family's boards on a regular basis, but I don't know what to do about sharpening edges. I used to have kind of a brass tool with a file on it that I'd run along edges but I can't find it and to be honest I don't even know if I was even using it right in the first place.

Is there a good BIFL (buy it for life) tool out there I could get that is dead easy to use?

[DownhillGoat]

There was a decent one posted in this year's ski thread but I'm too lazy to look for it.

KUU has a good manual for the DIYer.
http://www.kuusport.ca/manuals/

My recommendation is to stay away from the basic KUU metal one though and get something that slides better. The basic metal ones scrape the bases pretty good.