The International PHP Magazine has posted results from their latest poll conducted over this past week asking which, of their given options, is the best helpful hint for creating a web application in PHP.
Two of the options ranked higher than the rest with one (Page/object caching) coming out on top of the other (Don't save performance testing for the end of the project). The remainder of the votes were divided pretty evenly between the last three options: "Use multi result set queries to your database", "gzip compression", and "Tune your web server".
While you're in the polling mood, you should check out this week's new poll that wonders which of their options might be the biggest hindrance to PHP5's adoption in the community.