[gfd]

Monitor arms freed up a ton of desk space.

Wireless noise cancelling headphones helped with concentration.

UPS saved me a couple times from losing work during power outages.

[convolvatron]

monitor arms are _great_. you get your desk back, plus you can really just put your monitor away, or adjust it so that two people can see it, etc.

[causality0]

Unless you're as anal-retentive as me and are driven insane by the slightest hint of tilt to one side or the other.

[jedberg]

I keep a small level attached to the top so I can tweak it level.

[elric]

I built my own desk, and it's ever so slightly off-level. It's .... more annoying than I would care to admit.