Jitterbit is a leader in the integration of on-premise as well as cloud. They built a next generation data loader and which works excellent and the UI is fantastic!!!
Here is the installer for pre-release data loader
http://www.jitterbit.com/salesforce/data-loader
Some helpful guides for this data loader
http://www.jitterbit.com/Files/Product/JitterbitDataLoaderDatasheet.pdf
http://www.jitterbit.com/Files/Product/JitterbitDataLoadervsIntegrationComparison.pdf
Finally here is the community which helps you for any issues
https://getsatisfaction.com/dataloader
Here are some training videos
Try the new data loader and share your feedback
Here is a quick preview
SriniForce 
Added the training videos !!!
This new interface looks much better than official Salesforce data loader.
Yes it is 🙂
Guys. The final release for the NEW Dataloader for SFDC happened today. Yep. It is still FREE.
To get it, just visit the AppXchange and you will be able to download the mac or win version. As they say at Chilli’s, enjoy! Jim Willis @ Jitterbit.
Does it still need the API? They said following versions are not gona require it as Skyvva or Informatica Data Loader. We have Professional with no API and would like to thy this solution wich looks better and easiest to use.
Initially I like this tool. As I use it more and more it looks like it has lots of bugs. Hangs all the time.