Various brand shifts at the time...
Raw to SmackDown: Chris Benoit and Eddie Guerrero. And to an extent, Brock Lesnar, who started appearing on SmackDown to troll with The Rock.
SmackDown to Raw: Test, Lance Storm, Christian, William Regal, Chris Jericho
Sent to exile/injured reserve: Mark Henry and Hulk Hogan, both at the hands of Brock Lesnar.
Debuts: SmackDown got Rey Mysterio, making his first appearance on American wrestling television since WCW folded. Raw got Three Minute Warning, two 300+ lb Samoans named Jamal and Rosey, who basically come out at Bischoff's command and demolish whoever is in the ring, whether it's Shawn Stasiak, Mae Young, or a midget version of Goldust.
Alignment shifts: Trips turning heel, and Taker turning face. So much for awesome heel Taker -_-
And finally, a Where are they now? for the now dead nWo!
Kevin Nash - Injured until April 2003
Shawn Michaels - JaKyL explained this already.
X-Pac - Gone. Forever.
Big Show - Jobbing to Booker T and Jeff Hardy, among a few others.
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Dallas Cowboys: 8-8 --- Next Game: Next Year =(