.ASPX considered harmful: I always thought it would be f'ing hilarious to use mod_rewrite to change my .php extensions in one of my many projects to .aspx or .cfm.

Account login mistakes. Here is the summarized list:

• Mistake #1: Having a Sign-in In The First Place
• Mistake #2: Requiring Sign-in Too Soon
• Mistake #3: Not Stating the Benefits to Registering
• Mistake #4: Hiding the Sign-In Button
• Mistake #5: Not Making "Create New Account" or "Forgot Your Password" a Button or Link
• Mistake #6: Not Providing Sign-in Opportunities at Key Locations
• Mistake #7: Asking for Too Much Information When Registering
• Mistake #8: Not Telling Users How You'll Use Their Information
• Mistake #9: Not Telling Users the Requirements for Username and Password Up Front
• Mistake #10: Requiring Stricter Password Requirements Than The NSA
• Mistake #11: Using Challenge Questions They Won't Remember In A Year
• Mistake #12: Not Returning Users to Their Desired Objective
• Mistake #13: Not Explaining If It’s The Username or Password They Got Wrong
• Mistake #14: Not Putting A Register Link When The Sign-In Is An Error
• Mistake #15: Not Giving the User A Non-email Solution To Recover Their Password
• Mistake #16: Requiring More Than One Element When Recovering Password