There’s a really nice writeup/review of Buffy Between the Lines on Playtime Magazine:
Fanfiction has always been a dirty word. Maybe because a lot of fanfiction is actually very dirty. Maybe because a lot of it is complete rubbish. Let’s face it: as much as Buffy the Vampire Slayer fans love the show, it’s always been a bit of a leap to go from Joss Whedon’s snappy, witty and smartly written TV drama to a format generally believed to be badly written, hurried, ill-conceived and generally very poor. Actually it’s a bit of a leap for most to go from Whedon’s series to any related Buffyverse tales, whether in story or comic book form. Those that don’t, though, are starting to seriously miss out. When I first heard that a group of Buffy fans from the fanfiction community had gotten together to produce a Buffy radio drama I couldn’t contain my laughter. With the best will in the world, how could a bunch of amateurs hope to pull off something remotely credible, let alone worthwhile? None of the original cast, no established scriptwriters and not even a proper soundstudio. “Very quaint,” I thought, and promptly tuned in for comedy value.
Twelve episodes later, I’m on the brink of writing to Whedon, begging him to canonise the series and to give the team money and a proper studio to produce an official radio drama that would, undoubtedly, sell like hotcakes and be a worthy jewel in the Buffy crown. Not for my benefit, mind, as I’m now open-minded enough to head on over to the Buffy Between the Lines website and have my fill of this excellent show for free, but for those out there who are too driven by traditional media to give this a chance, thinking that something can only be worthy if they’ve succumbed to the marketing and paid for it. Let us instantly revise our swift categorisation of fanfiction as complete rubbish, then: Buffy Between the Lines (BBtL) is an essential item on any Buffy fan’s agenda, combining all the hilarious wit and humour alongside tense, involving drama and fascinating characterisation of Whedon’s original series. In short, it’s a superbly written triumph that’s beautifully acted across the board by its cast of amateur Buffy aficionados.