The jump into the 1d series is a big one and I know when I made the swtich I was looking for as much information on how to use everything as I could find. Here is a quick list of the majority of the things you need.

I recently picked up a few old Olympus Zuiko wide angles and used adapters to fit them on my EOS camera. Here are a bunch of useful links when looking into manual focus lens on digital bodies.

The newest 70-200 provides a great bang for the buck zoom lens.

Today Canon introduces the EOS 500D, 15 Megapixels, Digic 4, 1.6x Crop, 1080p HD Video. Estimated release 5/2009 and street price of $800.00 for body only.

If you are looking to get into panoramic photography, whether it is single row or mult-row, this is a nice guide on using Really Right Stuff (RSS) equipment to get the job done.