Remco from the Netherlands was friendly enough to send us some feedback on their tour:
Hi all,
Here follows an annotated list of the best records 6 keen birdwatchers from The Netherlands made during a very recent 16-day tour of NE India – Eaglenest, Nameri and Kaziranga. The tour lasted from Dec 23, 2007, until Jan 7, 2008. [...] All ground arrangements were made by Sujan Chatterjee from HelpTourism (much recommended), who also accompanied us during the trip. We camped during the Eaglenest part of the trip, fortunately accompanied by excellent cook Jivan. Weather was fine throughout the trip, with clear skies and no fog or rain. In the mountains, especially at Lama Camp and Bompu, the temperature at night was close to or even below zero C.

We recorded 457 birds, incl c. 10 heard-onlys and 20+ species recorded only at Okhla, Delhi. Heard-only incl Grey Peacock-pheasant, Common and Rufous-throated Hill Partridge, Himalayan Wood Owl, Spotted Laughingthrush, Slender-billed Scimitar Babbler, Rusty-bellied and Lesser Shortwing. Blue-naped Pitta was seen by only one participant (LS), near Khellong.
Mammal highlights included a male Hoolock Gibbon at Panbari Forest, a Malayan Giant Squirrel at Nameri and over 100 Indian One-horned Rhinos, 6 Indian Smooth Otters and 10+ Asian Elephants at Kaziranga.
Thanks, Remco for the nice and encouraging words.