If you go to the "Script Pages" forum you can post the first 5 or so pages of your script there for feedback. Occasionally people link to an entire script but you're not likely to get as many responses that way (when people do that I tend to just read the first couple of scenes anyway - it's a lot of time and effort to commit for a forum post).
If you want feedback on an entire full-length script you're better off going with a writer friend or looking at one of the paid feedback services IMO. If you look under "Sites, Services, Software & Supplies," there are some script coverage recommendations stickied with threads about their work.
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