In no order...

Midnight Express (Lane/Eaton of course)
Road Warriors
British Bulldogs
Arn & Tully
Steiners (pre-back injury..when Scott could hit a Frankensteiner)
Edge & Christian
Dudleyz (esp during the heel run in the ECW)
RVD/Sabu
WGTT
Benoit/Malenko (Horsemen edition)

Honorable Mention: Terry Gordy/Stan Hansen, Impact Playaz, The Islanders, The Varsity Club (Rotunda/Williams), and the Rockers

(on a side note..this list reminds me of a WWF Primetime where the final match was a re-broadcast of a closed circuit match from MSG of Dynamite Kid/Bret Hart match at the height of the Bulldogs Foundation feud...at the time, two midcarders, 20 minutes..a technical masterpiece...one of the best matches I've ever seen and I've never seen a copy of it anywhere...)

E&C
The Bushwackers
The Rockers
The Hardy's
Kane and The Undertaker
Legion of Doom
MOM
Angle & Benoit
Edge & Mysterio
The Dudley's

Slightly off topic but the Smackdown Tag Title Match Edge & Mysterio vs Angle and Benoit was my favourite tag match in a long time