Always curious to know what apps other's are using every-day that they just couldn't do without.

Hardware:

- iPhone5
- Surface (irregularly)
- 15" Retina MacBook Pro

Communication:

- Yammer (pretty much every day)
- Mail on iPhone

Productivity:

- nvAlt (mac) + Simplenote (iPhone) for notes/to-do's
- Lift for tracking habits
- Rescue time for tracking time spent on the computer by activity

Development:

- Vim for editing
- iTerm2 for my terminal
- Github for storage
- github.com

Social/Reading/Sharing:

- Twitter (mainly to argue and find good things to read)
- Facebook (mainly to connect with personal lives of people)
- Pocket (to read everything I find at my leisure)

Entertainment:

- Spotify and Pandora for music
- Netflix for video
- VLC for anything that I have an actual file to play

springpad on mobile (tablet and smartphone) and desktop
Hootsuite - mobile and desktop
Currents - Android
Tunein
Google Plus
AirDroid

Evernote (evernote.com) - And as soon as it finally gets shipped, I'll add the Moleskin Evernote notebook to this list.
Spotify (spotify.com) - couldn't live without it
Aptana (aptana.com)
Gimp (gimp.org)

Been meaning to chime in here for a while now.

Hardware:
- iPhone 4s
- 15" MacBook Pro

Communication:
- Trillian (chat client, kinda hate it. I hate Adium and iChat even more though)
- Propane (Campfire client. Updated infrequently, but best one on the market IMO.
- Sparrow (Mail client. RIP)
- Mail on iPhone
- Regular Ass Twitter for Mac and iPhone (hate them both, but refuse to spend money on another client when they could potentially have their API access killed at any time)

Productivity:
- Clear (Todo's for iPhone and Mac)
- Asana (Team task/project management for Mac and iPhone)

Development:
- Sublime Text 2 (Text Editor for Mac)
- Github (File Repo)
- Kaleidoscope (Diff/Merge tool for Mac)

- Sequel Pro (Tiny, reliable MySQL GUI for Mac)
- VMWare Fusion (Virtual Machines for IE testing)
Design:
- Adobe Photoshop / Illustrator CS6
- Extensis Suitcase Fusion (Font Management)

And that about sums up the apps that I use daily, or close to daily.

On my Mac
- Chrome
- Mail
- Adium
- Evernote
- Spotify
- Alfred

On my iPhone
- Chrome
- Flipboard
- Dailymail app
- Instapaper
- Kindle
- Whatsapp
- Quora
- NetBot
- Readmill
- Evernote
- Launch
- Spotify
- Google maps
- Flickr
- iPhoto

On my iPad
- Chrome
- Flipboard
- Instapaper
- Kindle
- NetBot
- Readmill
- Evernote
- Penultimate
- Good Reader

WEB:
- GitHub (enterprise and github.com)
- Simple
- Sprint.ly
- [i wish] Yammer
- Google Apps
- Medium (lately, been writing a lot of drafts in their editor)

HARDWARE
- MBPr 15"
- Cinema Display

SOFTWARE
- Spotify
- Twitter
- Textual
- VMWare
- iTerm
- Vim
- Dropbox

WP8
- Baconit
- Twitter (official)
- Spotify

On my PC:
- Evernote
- Scrivener
- Chrome
- Media Monkey

On my Android:
- Evernote
- Carbon (Twitter)
- Pocket
- RemindMe
- Gmail
- Google Calendar

I try to keep everything as simple as possible.