installing the 4.2 GM:

you need iTunes 10.1 beta to install 4.2
save your SHSH blobs if you think you’ll want to downgrade to 3.2.2 in the future
‘Restore’ the iPad with the 4.2 ipsw file

Download - Hotfile.com
http://hotfile.com/dl/81656723/0b5d647/iPa....part1.rar.html
http://hotfile.com/dl/81656739/d8c4184/iPa....part2.rar.html
http://hotfile.com/dl/81656756/1065721/iPa....part3.rar.html
http://hotfile.com/dl/81656768/743a4e8/iPa....part4.rar.html
http://hotfile.com/dl/81656858/f64fcdb/iPa....part5.rar.html
http://hotfile.com/dl/81656896/251e476/iPa....part6.rar.html

Mirror:

Download - FileServe.com
http://www.fileserve.com/file/cHbThf2/iPad iOS 4.2 GM (8C134).part1.rar
http://www.fileserve.com/file/JbPmAZW/iPad iOS 4.2 GM (8C134).part2.rar
http://www.fileserve.com/file/H6aYt9G/iPad iOS 4.2 GM (8C134).part3.rar
http://www.fileserve.com/file/vM2YmKj/iPad iOS 4.2 GM (8C134).part4.rar
http://www.fileserve.com/file/SXXzhEz/iPad iOS 4.2 GM (8C134).part5.rar
http://www.fileserve.com/file/Hb2Q4ZP/iPad iOS 4.2 GM (8C134).part6.rar

Mirror:

Download - Uploading.com
http://uploading.com/files/5ea4b6d3/iPad%2...2529.part1.rar/
http://uploading.com/files/mm72879m/iPad%2...2529.part2.rar/
http://uploading.com/files/5b8dc55a/iPad%2...2529.part3.rar/
http://uploading.com/files/c25fd5a2/iPad%2...2529.part4.rar/
http://uploading.com/files/7858m771/iPad%2...2529.part5.rar/
http://uploading.com/files/6c836ac6/iPad%2...2529.part6.rar/

Mirror:

Download - FileSonic.com
http://www.filesonic.com/file/31043339/iPad iOS 4.2 GM (8C134).part1.rar
http://www.filesonic.com/file/31043427/iPad iOS 4.2 GM (8C134).part2.rar
http://www.filesonic.com/file/31043337/iPad iOS 4.2 GM (8C134).part3.rar
http://www.filesonic.com/file/31042337/iPad iOS 4.2 GM (8C134).part4.rar
http://www.filesonic.com/file/31042333/iPad iOS 4.2 GM (8C134).part5.rar
http://www.filesonic.com/file/31042259/iPad iOS 4.2 GM (8C134).part6.rar

Mirror:

Download - Uploader.to
http://ul.to/8v9u83/iPad%20iOS%204.2%20GM%...C134).part1.rar
http://ul.to/gudrql/iPad%20iOS%204.2%20GM%...C134).part2.rar
http://ul.to/6jw25w/iPad%20iOS%204.2%20GM%...C134).part3.rar
http://ul.to/69t2t6/iPad%20iOS%204.2%20GM%...C134).part4.rar
http://ul.to/s372lm/iPad%20iOS%204.2%20GM%...C134).part5.rar
http://ul.to/cckbhl/iPad%20iOS%204.2%20GM%...C134).part6.rar