Booking is recommended for most of these places. List goes:
Bohemia http://www.bohemia.ch (Kreuzplatz)
"I love the fresh OJ and good coffee. Also the pancakes. Full english is available."
Iroquois http://www.iroquois.ch/iroquois/ (Seefeld)
(and maybe its branch in Oerlikon, Cheyenne)
"Full english available. I found that it had less choice than Bohemia."
Imagine (Hbf)
"Not tried personally but has been recommended by many people."
La Terrasse at Limmatquai 3. (Just beside Bellevue)
"Great Sunday brunch, eat inside or outside, but book in advance for the best tables."
Marriot http://marriott.com/property/propertypage/ZRHRN (Glattbrugg)
"A friend of mine just mentioned having taken some clients to brunch at
the Marriot in Glattbrugg. I haven't tried it myself. "
"The Sunday Brunch at the Renaissance Zürich Hotel is all that you can wish for. I work there, so I know what I am talking about. They will start serving again mid-August..."
Movie restaurant (next to the ABC Kino)
Across the street from Zurich HB. Lots of outdoor seating (30 or more tables).
"...excellent Sunday brunch the last time I was there"
Restaurant at the Rote Fabrik http://www.ziegelohlac.ch/index.php (Wollishofen)
"There is a nice restaurant at the Rote Fabrik where you can get brunch
for around 20 CHF... The Rote Fabrik is kind of a theater/music venue on the lake near
Wollishofen. It's got kind of a bohemian atmosphere, but I think
anyone would enjoy it for brunch. They open on Sunday at 11:00 with
gipfelis/bacon and eggs and start serving a few more dishes at 12:00."
Seerose http://www.dinning.ch/seerose/ (Wollishofen)
"does a fabulous brunch and in this weather is the ideal location. Perhaps a little pricey but the location is great."