A Few Good Mel's

Animation can be tricky, so anything that helps to facilitate workflow, I'm all for. Here's a few melscripts that I've found to be quite useful.
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pose2shelf
This is the first script you should have in your arsenal. It's a simple little script that allows you to save poses and selection sets to the shelf.

abxPicker
A very robust and versatile script that lets you create your own GUI (Picker) for your puppet.

shotView
Very helpful when animating to a specific camera. No more tearing off panels!

abxSmartKey
Key only what's highlighted in the channel box. Also use it to filter channels in the graph editor. Just don't forget to toggle it off when you don't need it.

snWorldSpaceTool
Copy and paste translate and rotate values regardless of heirarchy. Comes in handy when you need to pick up objects, set'em down, etc.

autoTangent
Quick way to soften tangents and correct overshoot when time is not on your side (esp. for multiple curves).

tweenMachine
Quick way to ease in and out of poses, again when you need to finish that animation by lunchtime. Sure you could just middle-mouse and key, but this is more fun.

cMotionTrail
Better way (in my opinion) to create motion-trails in Maya. I had a friend make a small mod to the script to include a delete (trails) button. E-mail me and I will share.

AnimRange
Good for breaking down long scenes into smaller, workable chunks.

animToolBox
A suite of some sweet tools.

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Lastly, I want to make sure I give credit and thanks to all the mel guru's out there that created these scripts and were nice enough to share them with us.