iOS 8 Beta 1 Download Links:

Uploaded.

iPhone:
iPhone 5s (Model A1453, A1533)  – LINK
iPhone 5s (Model A1457, A1518, A1528, A1530) – LINK
iPhone 5c (Model A1456, A1532) – LINK
iPhone 5c (Model A1507, A1516, A1526, A1529) – LINK
iPhone 5 (Model A1428) – LINK
iPhone 5 (Model A1429) – LINK
iPhone 4s  – LINK

iPod Touch 5G – LINK 

iPad:
For all models here

Updated. How to install iOS 8 Beta without UDID registration (Thanks)