I'm still adding features to this, but here's my latest creation...
I noticed that bitcoinwisdom's difficulty estimator seems to be broken lately, and fork.lol's estimator uses the average of the last 12 hours of blocks which causes some estimate oscillations, I decided to whip up my own. It's a live-updating visualization of all blocks in the current difficulty period, with some stats including a live projection of the next difficulty adjustment (using the average rate of all blocks mined so far in the current period). All times displayed are in your local time. Enjoy!
CryptoThis - Live-Updating Bitcoin Difficulty Visualizer/Estimator - https://cryptothis.com/diffPlease let me know if you have any suggestions or features you'd like added. Thanks!