The Seahawks joined the league the same year, have a 367–340–1 (.518) franchise record, and are 1–2 in Super Bowls.
The Bucs have a franchise record of 278–429–1 (.393) and are 2–0 in the Super Bowl.
The Dolphins are 467–377–4 (.551) and are 2–3 in the Super Bowl.
Since 2000, the Ravens are 201–135 (.598) and are undefeated in the Super Bowl, with two wins, making the playoffs 13 times since their first win in 2000.
Since 2000, the Buccaneers are 149–187 (.443) and are undefeated in the Super Bowl, with two wins, only making the playoffs four times since their first win in 2002 (and winning it all half of the time).
And this century, only the Patriots (6), Giants (2), Ravens (2), Steelers (2), and now Buccaneers (2) have won multiple Super Bowls. The Giants is the only other of those team with a losing record over that timespan. But they at least have 164 wins to 172 losses in that time, and that's despite going 18–46 the past four seasons.
Oh yeah, and the obligatory: Steelers have gone 217–119 (.646) since 2000. They have as many SB wins in that timespan as the 149–187 Buccaneers.
Broncos have gone 187–149 (.557) and have one win, but they at least won a couple just before the cutoff.
The Packers have gone 217–117–2 (.649) and also have one championship this century.