So check this out... TC Polytune guitar tuner is kind of insane. Instead of individually checking each string, simply strum all six open strings, and Polytune's LED display shows which strings are sharp and flat. Follwing this, you can fine-tune each string with Polytune automatically detecting that you're doing so and changing its display mode accordingly.

Truly amazing, kind of scary, and likely to help out hacks and talented musicians alike. Coming next month at $99.95, just like Earl Scheib. Pre-order now, will sell like hotcakes.