I’m not trying to compete with BibliOdyssey or anything (check out his book!), but the digital portion of the New York Public Library’s Mid-Manhattan Picture Collection is something to marvel at and mine for visual treats. Below, a completely random selection of archival rarities. Click them for more detail.
Page design by Georges de Feure, 1900
Illustration [...]

Burroughs cut-up machine (for that clunky, surreal Ghostface flavor)
Rhymezone dictionary (”What else rhymes with ‘yo’?”)
LucJam’s American Brandstand chart (if you’re gonna drop brand names in your rhymes, be original about it. These are already taken.)
Sample FAQ (innovation by association)
The Original Hip-Hop Lyrics Archive (double-check insular references)

Number of new weblogs launched per day, according to Terrence Smith’s report on the NewsHour last night: 2,160
Number of seconds between each launch: 40
Number of professional journalists with personal weblogs who have recently been forced to stop blogging by their employers, according to Mark Glaser’s latest column: 3
Average American newspaper reporter’s base salary, according to [...]

In his new meditation on the turntable in ctheory, Seattle writer Charles Mudede calls upon Heidegger, Marx, Walter Benjamin, Afrofuturist David Goldberg, DJ Marley Marl, Russian Formalist Viktor Shklovsky and, unfortunately, Tone Loc to shed light on the true essence of the turntable. Very much worth a read, as he goes miles beyond the typical [...]