One of the great features of Chrome is the countless extensions that can add extra features. Here are the extensions I couldn't get by without.
I love twitter and use it in primarily two ways: to share resources and have conversations. Often, I'll find links in bunches and at unusual times. Rather than deluge my followers with 10 link tweets in the middle of the night, I use Buffer to space my tweets out and post at times that the majority of my followers are online. I'm generally very wary of any tools that auto-tweet (spam) on my behalf, but buffer is different in that every tweet is mine -- I'm just time shifting the tweet to a better time. I highly suggest you check this one out if you are a heavy social media user. Buffer
Evernote is amazing. It's become my digital brain, where I store reference materials and notes. The easiest way to get a web page or pdf into Evernote is through this extension. Evernote Web Clipper
Too many passwords? Don't fall into the trap of reusing the same one everywhere. Use LastPass to remember your passwords. The form fill feature alone is a huge time saver as it'll fill your saved information (address, email, etc) with one click. LastPass
Pocket is a read it later service. I'll click this extension when I have something I'd like to read but don't have time to now, and it'll be added to my Pocket account.Then, when I have time I'll use the Pocket iOS app and enjoy some longer reads. Pocket
This is a fantastic extension that helps in the writing process, particularly by reading back text in a Google Doc. I'll often catch writing mistakes by listening to Read&Write. Anything that helps improve my writing is a must have for me! Read&Write for Google Docs
YouTube is full of great videos, but it's also full of some not-so-great ones that always seem to be recommended on the side of the videos I watch. YouTube comments are notorious as a display of the depravity of the human race. Especially when teaching or presenting, I don't want those distracting aspects on display, so I'll use Turn Off the Lights to black out everything but the video itself. Turn Off the Lights
The voicemail service at my school is able to email messages as a .wav file. Before this extension, I had to download the attachment and use an application or OSX's quick look to listen. Now this extension adds a player in the email, no download needed. WAV Player for Gmail
Those are the extensions that work for me. I'd encourage you to try them out, but also to look through the Chrome Web Store and find extensions that work for you.
Did I miss any must have extensions? Please let me know in the comments!