Stephen,
Good to know. Hopefully, you're still young yet.
Spar,
I agree. I've been using multiple wattmeters between my larger glow conversions and micro-flight projects. Now I can use just one wattmeter for everything.
Here is another application that comes in handy for the lower-end chargers. You can monitor the charge that you put back into the pack and keep a closer eye on the actual current being applied to the pack. I love the inexpensive Apache 2500 chargers for 1-4 cell Lithium packs but often want to measure just how much I depleted the pack after a flight. The "Watt's Up" watt meter allows me to do it if I reverse the connector sex by using adapters. Shown here is an already charged 2-cell Kokam 1500mAh pack that I am just tweaking up to 8.4v.