ETHER ADDRESS LOOKUP CHROME EXTENSION 
http://harrydenley.com/ethaddresslookup-chrome-extension-release/
I've been spending the last week or so creating a Chrome extension to solve a problem I was having on other communities. The problem I was having was people posting their Ethereum addresses (mainly to ask why a certain txn was at a cancelled status) without linking it to a block explorer, so I had to copy/paste the address into a block explorer and this was happening around 5-15 times a day and I got a little tired of it, so I made a Chrome extension to do it for me (plus more).
Currently, the extension looks for Ethereum addresses on the active tab, adds a link to your favourite block explorer, and (if turned on) highlights the match.
I've made the UI as simple as possible and will be pushing more updates to it very soon.
I've put the extension onto the Chrome Extension store (https://chrome.google.com/webstore/detail/etheraddresslookup/pdknmigbbbhmllnmgdfalmedcmcefdfn) but also giving installation instructions on the repo if you don't trust the source (you can install it manually after inspecting the code) - https://github.com/409H/EtherAddressLookup#manual-installation
Features currently being tested
Add labels to addresses
Since Chrome has client side databases, I am utilising this to store user specified labels to addresses that will show next to the address and be editable (ie: "Bills Address", "Possible scam address").
Show address stats
When you hover over the address, a small popup will appear showing the amount of $ETH on the address with a count of transactions that it has made.
You can track the future features here: https://github.com/409H/EtherAddressLookup/issues?q=is%3Aissue+is%3Aopen+label%3Aenhancement
If you have any questions/issues, it's best if you could open up an issue on the GitHub repo: https://github.com/409H/EtherAddressLookup/issues/new
Thanks for reading,
Harry
(Be sure to upvote, re-steem, and comment :))