There's an interesting set of posts from PHP community members Adam Culp and Cal Evans each on a similar subject centering around conferences and the presentations made at them. They both wonder if talks are getting too "soft" and not focusing as much on the technology and getting in-depth as they should be. From Cal:
PHP conferences are changing very slowly, and not in a way that I like. I blame myself. As a frequent speaker I am getting lazy. I get caught up in the excitement of the CfP, I write up 5-10 abstracts and shotgun them into the CfP system hoping that something hits the mark. I've not actually written these talks. In most cases, I'm pretty sure I can get 45 minutes on the topic, but I don't know for sure because I've not bothered to write it yet. Adam Culp talks about this very thing in his post "Are Conference Talks Getting Too Soft?".
Adam points out that, while introductory talks and overviews are acceptable level coverage for someone new to the speaking scene (or development), the trend seems to be that everyone is providing less "meat" in their talks.
It is hard to teach a great amount in a 1 hour talk, but if there is not some immediately usable content an attendee will have a tough time proving to their short sighted boss that it was worth their time.
Both Adam and Cal set out a challenge, both to themselves and other speakers in the community. They encourage you to spend more time with your subjects, get in-depth into the topics, present on what you're excited about and maybe even try them out locally first.