Yes, I just discovered the POWER SEARCH feature missing and had a mini-meltdown until I read the above advice, I found the power search, using the STORE button on the main menu, I click "search" and the power search page pops back, so wharever idiot at Itunes thought it a good idea to delete Power serach from the Itunes webpage needs a smach in the head, and put the power search feature back, duh.
Official word from Apple Support about axed features in iTunes 11:
I sincerely apologize for the delay in response from us due to long week off. I know it must have been difficult for you to wait for a response from us and I deeply regret that.
I am sorry to inform you that the following features are no longer available in iTunes 11:
2. Gifting Custom Playlists
3. Alert me
4. Power Search
If you have any comments to be posted on this issue, please visit the following site and update your comments on the feedback page:
Apple recognizes that no one is better qualified to provide feedback about iTunes than the people who use it.
I encourage you to use the iTunes Feedback page to submit your comments:
Your efforts to share your feedback are very much appreciated.
Thank you for your understanding and patience. Apple appreciates your business.