So...
I'm not sure about linking youtube videos in DTF (still reeling from sanctions from my days in the MP Forum), but youtube has a multi-part documentary on The Smiths from the BBC archives. It's called Young Guns.
Also, if you could find it, a documentary called The Smiths-Under Review was on youtube for a while but got pulled. Perhaps there's someone else out there that hosts it.
I hope you picked up the recent The Smiths-Complete box set. It pretty much had everything they've officially released in one package. I enjoyed the reproduction of the vinyl sleeves for the CD copy. Too bad I don't have the big $$ to shell out for the vinyl version of the set.
I wish I could go back and recapture the feeling of listening to their music for the first time all over again.
An interesting thing about The Smiths' fanbase nowadays: a lot more metalheads of the modern persuasion admit to liking the band, perhaps because the newer generation has openly embraced punk and post-punk as influences to the new breed of metal that's been coming out of the woodwork. Some of the most vocal fans of the band lately seem to be in progressive black metal bands to be specific (Deafheaven and Tombs just to name a couple).