Bob Sakoui, that lovely doyen of design, posted this thoroughly nourishing collection of some of his favourite Flickr sets at Original-Linkage:

There are many great flickr collections out there and they do make for great inspiration, so here are a few varied old and new sets that you may have missed...
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Type Specimen Books by type foundries pre WW2. Collections by Henning Krause.
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Here's a pretty good collection of matchbox cover designs.
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Worth flicking through ABCVerlag's design book pool.
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1960’s and 1970’s Scandinavian logo collection by Oliver Tomas
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Here's a super graphic design collection from Insect 54.
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Many gems to be found in Acejet170's flickr collection.
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A collection of modernist design by Alphanumeric.
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More classic design collections from Ellen McFadden.
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Another nice design collection including scans of The Barbican brand guides by Ajones87.
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A ton of type at Typofile's flickr sets.
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Also worth looking at the Typography and Lettering pool flickr set.
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An extensive collection of Found Type.
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Another pool of Vintage Type
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A big selection of vintage logos taken from a 1970’s book called ‘World of Logotypes’.
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A collection of assorted graphics by Stéphane Massa-Bidal.
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Avant guarde and great, sets from 9000.
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Today, Aisleone blog, brings to our attention another rather nice flickr set of vintage ads, which you can see here.
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Vintage imagery and type to be found in Agence Eureka's sets.
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More vintage imagery fromThe Vintage Collective.
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Another rather large and unusual collection of vintage ads by Gatochy.
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Lovely set of typewriter ribbon case designs from Uppercase.
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Of course there are a few more great flickr sites out there, but these should keep you happy for at least the weekend!

Enjoy!