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You might try visiting the following WebmasterWorld forums:
New To Web Development
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Graphics Design and Usage
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Content
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Webmaster General
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All of the above can offer insight, inspiration and good advice for webmasters looking for fresh approaches. Browse the forums and see if something sparks... Inspiration happens! ;)
But you don't even have to buy a book; just spend a couple hours in a big bookstore browsing the design magazines and design books, chances are you will feel invigorated and inspired by their examples and tips.
By the way, don't restrict yourself to the computer book section... Spend some time browsing in the arts & design sections as well.
As far as discovering individual useful features to include, try browsing in the area that best fits the content of your website. Look for "talked about" features there, find the "hot buttons," and then figure out how you can meet the demand.
You might also find some good advice in these recent Webmaster World threads:
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