The always-excellent Museum of London has a wealth of resources on the Great Fire, and there's a new exhibition - Fire! Fire! - which opens in July 2016. Here's the museum's present collection of Fire-related artefacts.
Other resources, including some educational material, is online at the National Archives site.
Harrison Ainsworth's 1841 historical novel Old St Paul's, which was perhaps the first to conflate the plague and the Fire into a single narrative, is available in multiple free ebook formats from Project Gutenberg.
BBC Radio 4's In Our Time has an episode on the Great Fire archived here.
And in the interests of completeness, here's another attempt to mix comedy and history, in the History Bites retelling of the Great Fire: