Nothing speaks better than code examples, here you are:
 A Java clone of 
Retwis showcase integration between the 
Play! framework and Redis 
Google Code Project PageA PHP Twitter clone, the original example of Redis capabilities. With a 
live demo, and an 
article explaining it design. You can find the code in the Downloads tab.
A simplied version of the application running 
http://twatcher.com/ from Mirko Froehlich (
@digitalhobbit) with a full blog post explaining its development at 
 Building a Twitter Filter With Sinatra, Redis, and TweetStreamThe "simple" Redis-based queue behind Github background jobs, that replaced SQS, Starling, ActiveMessaging, BackgroundJob, DelayedJob, and Beanstalkd. Developed by Chris Wanstrath (
@defunkt) the code is at 
http://github.com/defunkt/resque, be sure to read 
the introductionA port of 
Retwis to Ruby and 
Sinatra written by Daniel Lucraft (
@DanLucraft) Full source code is available at 
http://github.com/danlucraft/retwis-rbScanty is 
minimal blogging software developed by Adam Wiggins (
@hirodusk) It is not a blogging engine, but it’s small and easy to modify, so it could be the starting point for your blog. 
This fork is modified to use Redis, a full featured key-value database, instead of SQL. 
A 
very simple note taking example of Ruby and Redis application using 
Sinatra. Developed by Pieter Noordhuis 
@pnoordhuis, you can check the code at 
http://gist.github.com/86714