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To get started you can find a basic introduction to the language in Solidity Tutorial.
Check out Solidity Features page with the list of already completed Solidity features with explanations and demonstrations, it is being updated continuously. More technical information you can find in the Pivotal Tracker.
You can start using Solidity in your browser with no need to download or compile anything. This application only supports compilation - if you want to run the code or inject it into the blockchain, you have to use a client like Geth or AlethZero.
Also check out more documentations for Solidity ABI and a Crowdfunding example contract written in Solidity.
You can find the changelog here.
Solidity is still under development. So please do not hesitate and open an issue in github if you encounter anything strange.