LIP Language Packs
No Windows 7 LIP language pack exists as of now. Any contradictory information is both incorrect and a waste of time. Furthermore, LIPs are limited to non-major languages similar as explained in Bright Hub's article on Vista Language Packs.
The images GB1LCLPCKCFRE_DVD.iso (0xFCB14E84) and client_localpacks-GB1LCLPCKCXFRE_DVD.iso (0×21195B94) from Microsoft Windows 7 Beta downloads in the the next but one section do NOT contain language packs! Rather, they belong to “multilingual applications on a multilingual Windows image"  in Windows Automated Installation Kit for Windows 7 Beta.
Thus, 32-bit and 64-bit versions of the files listed below are NOT language packs for Brazil, Spain, France, Italy, Mexico, Netherlands, Poland, Russia, Turkey, Taiwan, or South Africa:
Windows-LocalPack-BR-package, Windows-LocalPack-ES-package, Windows-LocalPack-FR-package, Windows-LocalPack-IT-package, Windows-LocalPack-MX-package, Windows-LocalPack-NL-package, Windows-LocalPack-PL-package, Windows-LocalPack-RU-package, Windows-LocalPack-TR-package, Windows-LocalPack-TW-package, and Windows-LocalPack-ZA-package
If you try to install them as language packs you will see the following error message: ‘Corrupted or invalid language pack file. Selected language pack is corrupted or invalid; please try a different file or location.’