A few minutes ago, we deployed hotfixes to address issues with Dwarven and Night Elf archaeology projects. The following projects are now available during the Cataclysm Classic Pre-patch:
Dwarf

Silver Kris of Korl
Warmaul of Burningeye
Word of Empress Zoe
Pipe of Franclorn Forgewright
Spiked Gauntlets of Anvilrage
Scepter of Bronzebeard
The Innkeeper’s Daughter

Night Elf

Wisp Amulet
Carcanet of the Hundred Magi
Umbra Crescent
Bones of Transformation
Silver Scroll Case

We also double-checked on the Pterrordax Hatchling and found it waiting as intended in Fossil Digsites at Archaeology skill level 525.