Is Signal a good, generic conference? I keep getting Twilio's emails about it but have never considered going as it seems about as interesting as a Google Maps API conference, ie: only focusing on using one company's very specific product family. That said, if you're doing anything telephony or messaging-related, it would be a good one for sure.

True. It's more centered around communications, but with Twilio expanding their product line recently (Video, IP Messaging, etc) I would think this is going to become more general. Last year it was a great conference and I'm sure it's just going to get better.