What are the advantages to upgrading from 10.7 to 10.8?

Can anyone direct me to an overview of the advantages (and any disadvantages?) of upgrading from OS 10.7 to 10.8 (Lion to Mountain Lion).
I use wireless streaming of music in my house and it drops out a lot (music stops) are there any improvements to airport express / wireless streaming?
Thanks,
Alan

Read:
http://www.apple.com/osx/

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