Vinyl or CD. This blogger just wrote a great post sharing some of things that flip him from streaming something to buy it http://yvynyl.tumblr.com/post/18080754208/cases-in-which-i-will-buy-new-vinyl
Do you keep a list of what you want to buy so you don't forget? Do you mostly just grab stuff via online stores? Do you ever feel like the fact you can always access a song you love online, usually for free, makes buying it seem a bit silly? Is the audio quality you can hear it at important? (not sure why I am firing off all of these Qs but I am sort of curious)
I'm probably not the best example as I get a fair few promo CDs and have never really started a vinyl collection (although I have all the Elliott Smith, Shins and most of the Weezer records on vinyl, plus a heap of things on 4AD) and always have too much music to plough through. I do however end up buying far too many hoodies and t-shirts when I realise how obsessed I've got with an album (or in the case of 'Glass Jar' a single song)
Do you think services like Spotify, Youtube and Soundcloud (and DiS, in some respects - although we removed the buy links from our review pages as we found it was having a strange psychological affect on people's perceptions of positive reviews being there so we could try to get a few pence sales commission...) could do more to encourage you to buy things at the point you're excited by it? Or at least to remove some of the 'friction' of having to go and find something - especially if the band have a hard to google name? Was an interesting piece about that here: http://musically.com/2012/02/10/with-teeth-spotify-direct-to-fan-could-be-a-perfect-partnership/
I was also fascinated by Gotye's YouTube plays vs the disproportionately small amount of Twitter followers and Facebook 'fans' he'd gained. Seems maybe some sites and services could do more to join those dots too? It's something we're considering doing for DiS.