I will volunteer some info for the Mumbai lounge:

-BA operated lounge, I don't believe it contracts to any other airlines (except, of course, other oneworld pax departing during opening hours
-Times: Currently open 0940 to 1340 and 2245 to 0245 (4 hours before the BA services [138/198] until they depart). This will change if the timetables change.
-Access: AFAIK standard BA and oneworld rules
-Location: Terminal 2, airside, left after descending from security
-Business center, many computers (around 16, I believe), and printer
-Magazines and British newspapers
-Multiple TVs
-Phones and power
-3 showers and washrooms within the lounge
-Free WiFi access available from front desk on request

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Food&Drink
-Sandwiches and Indian food available for both departures
-A generous selection of wines, spirits, mixers, beer, and juices
-Selection of cheeses, fruits, dried fruits, crisps
-Teas and coffee
-Champagne available

Photos of the lounge are available in my TR, http://www.flyertalk.com/forum/briti...-thoughts.html

I would give some info on the VIE lounges, but they are so bad I only visit them if I need a printer
Also I will be taking photos of the EWR lounge on Saturday on my next visit and will post latest info then.