Peronally, I would like to see a quicker turn around on email alerts for updated threads on a regular basis.
Most of the time I won't see an email notification up to 30 minutes or more after a thread had been updated.
We have been having email server issues the past few days. The email server was malfunctioning for most of Saturday, and the number of emails in the queue created an enormous backlog.
With regards to email alerts for updated threads, we send those out in batches once an hour. You can subscribe to our mailing list for instant alerts, but prepared to receive a lot of emails. It works like a traditional bidirectional listserv and it's recommended that you create rules for your mail client to filter and sort, but once you do, it's powerful.