Quote from j_medved:
E*Trade works as of today. No idea about Schwab. However QT integrates with Schwab by reading the HTML pages (not streaming). If Schwab redesigns their web pages, QT will stop working. Such snapshot quote integration is more likely to get messed up then when QT connects to streaming datafeeds.
Now, how about FirstTrade and ScottTrade, do they all have streaming?
Here is FirstTrade descripion on QuoteTracker.com:
"Free real-time quotes for customers only. Streaming quote option only supports NASDAQ stocks. Snapshot auto-refresh quotes support all US stocks"