Like it Dave, overall.
Nice, clean, uncluttered feel.
Only minor problem, as I see it, is that the artist 'search' is only applicable to the format area that you're in at the one time - as opposed to being 'relational' across all formats.
EG: A search on 'Sam Dees' reveals 9 titles in 45's but only 1 title in LP's.
A relational database would reveal all 10 titles, so that those looking for everything by a particular artist would see all stock by that one artist in one search. Take a look at how Moerer & Manships work - e.g. try the same search (Sam Dees) from the home page on raresoulman.co.uk and it reveals two pages of material from the one artist across all formats (45's / CD's / LP's etc.).
Not a showstopper... but with a bit of tweaking where the search is across the whole site rather than in one section at a time would improve visibility (and therefore, sales) significantly (IMO).
Sean