Perian, the OSX video software that adds support to Quicktime for many video formats has finally come to an end. The developers are moving on but have decided to upload the source code to Google Docs or Github. Perian add these libraries :

• libavcodec, from the ffmpeg project, along with code from the old FFusion component:
• MS-MPEG4 v1 & v2
• DivX
• 3ivx
• H.264
• Flash Video
• Flash Screen Video
• On2 VP3, VP6, VP8
• H263I
• HuffYUV and ffvhuff
• Indeo 2, 3 & 5
• MPEG-1, 2 & 4 Video (in supported formats)
• Fraps (up to v4)
• Windows Media Audio v1 & v2
• Flash ADPCM
• Xiph Vorbis (in Matroska)
• MPEG Layer I and II audio
• DTS Coherent Acoustics audio
• Snow wavelet video
• DosBox video
• Nellymoser ASAO audio
• libavformat, from the ffmpeg project. along with AVIImporter.component:
• AVI file format
• FLV file format
• NUV file format
• libmatroska, along with matroska-qt.component:
• MKV file format
• Subtitles:
• (Advanced) SubStation Alpha
• SRT
• SAMI
• VobSub
• liba52, via A52Codec:
• AC3 audio

You can read their final message here

OS X Lion Update 10.7.4 (Client) – 693mb
OS X Lion Update 10.7.4 (Client Combo) – 1.4GB

Below is the email from Apple:

Dear iWork.com user,
Thanks for participating in the iWork.com public beta.
Last year, we launched iCloud, a service that stores your music, photos, documents and more, and wirelessly pushes them to all your devices. Today, there are already over 40 million documents stored on iCloud by millions of iWork customers. Learn more about iCloud.
With a new way to share iWork documents between your devices using iCloud, the iWork.com public beta service will no longer be available. As of 31 July 2012, you will no longer be able to access your documents on the iWork.com site or view them on the web.
We recommend that you sign in to iWork.com before 31 July 2012 and download all your documents to your computer. For detailed instructions on how to save a copy of your documents to your computer, read this support article at Apple.com.
Sincerely,
The iWork team