Startup Lessons Learned is 798 pages, and covers August 2008 - now. The Venture Hacks Bible is 1406 pages, and covers March 2007 - now. Best of Andrew Chen's Blog is 984 pages, and covers 2006 - now. (It was 1700+ pages unedited, but it's curated.) Sean Ellis's book Startup Marketing: Unlocking Startup Growth is 168 pages, but that's all the content there is.
So even if you ignore the pages that are bogus (TOC, index, etc), you've got about 2500+ pages just for the Leanpub books. These PDF books sell for $29.99, $19, $19 and $19 regular price. The ideas in them are worth a huge multiple of $42, imho.
The really good thing is that all the content in all these books is available for free on the authors' blogs. Part of the inspiration for Leanpub is Paul Graham's Hackers and Painters, which followed a similar model, but was published by a traditional publisher. We're doing the blog-essay-into-book thing for self-published authors.
Hackers and Painters is worth the money (either as a PDF or as a print book), since you think more deeply about the content when it's in book format than you do when it is on a blog and you're distracted by Hacker News and ooh there's a new Twitter CEO and look a shiny toy and kittens. That's the Leanpub value proposition, and why these books are worth buying. (It encourages you to fully read the archives of these 4 blogs, all the way back.)
Now, Leanpub is actually a system for writing and publishing in-progress books, not for just selling exports of blogs. Authors can sell books before they are finished, and when new versions are released the readers can be automatically emailed.
We launched our new version last night at 3 AM which included the first versions of features designed to support better communication between authors and readers, etc. However, the Appsumo bundle promptly crushed us.
(We're spinning up bigger servers today and temporarily disabling some features for Leanpub authors to cope with the Appsumo email blast that will go out tomorrow. Leanpub is more than the not-fully-baked-and-slow site that you see today.)
Later this year we're rolling out features including a good way to do online/offline editing for nontechnical users, etc. The architecture already supports this now. This will also include EPUB and MOBI generation, etc.
So, anyway, the timing could have been better for us, but the books here are good and are worth reading. If you have any issues, please email me (peter@leanpub.com) or phone me (604.916.8017) and we will ensure you get your downloads etc.
Thanks, Peter Armstrong Leanpub Cofounder