I've found GemWP to be a useful resource for blogs and articles about WordPress, stock images, font resources, copywriting, and more.
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From WPMUDev, here's the ultimate guide to keeping WordPress secure. Everything from checking to see if your site is blacklisted, how hackers get in, important installation settings, the importance of correct file permissions, disabling XML-RPC, blocking individual IP addresses, and more.
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I'm loving this WordPress setup infographic (click to go to the source site, opens in a new window):
Brand New Trial Offer:
Remotely Manage & Control Your WordPress Sites
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(Starting at Just 99 Cents)
I bet you'll find at least 10 to 20 tips and tricks for the latest version of WordPress in this helpful guide from Hongkiat:
My personal favorites are WP Rollback (roll back to an earlier version of a plugin), and adding voice search to your WP site.