A few clarifications here.....
1. For intel HT= HYPERTHREADING NOT Hypertransport. Hypertransport is for AMD only.
2. As others have mentioned your 184 pin DDR is DDR and not DDR2.
Hyperthreading basically allows a single core CPU to act as if it is a dual core, but not really. Its Intels first attempt at moving towards multi-core processors before C2D came out.
Many Northwoods are actually subdivisions of Celerons, and some of them are subdivisions of Willamettes, and some of them are just plain ole Northwoods.
A P4 2.8 Northwood is likely just a Northwood and not a subdivision of anything.
What is the s-spec written on the IHS of the CPU?
Any s478 mobo that supports Celerons will also support Northwoods so pick what you like and go for it.
For more detailed info regarding your specific processor hunt around at CPU world.