can anyone tell me if the following tablets can load books.
dell streak
htc flyer
samsung galaxy (P1 or the P7100)
its very urgent
blackberry playbook
Short Answer: All the Android tablets can load anything you want them too .... anything.
BUT there's a better way to think about the problem of ebooks on Android tablets.
Long Answer:
I cannot comment on the single option in your list which I have not personally used namely the Playbook but for the remainder which are all Android based. I would say the HTC Flyer if you can get one but the new Galaxy 10inch is enticing and then there's the ASUS EEPAd transformer (comes with a keyboard docking station...) for which you can get a WIDE number of e-book reading applications.
However I would recommend that you use the multi-platform ebook librarian program called "Calibre" to translate all your ebooks to a single format and you need only one of these ebook reading programs. (
http://calibre-ebook.com/) it's free and donations to the developer for this excellent tool are highly recommended.
Then with Calibre to perform the cross-conversion, you can then select the reading program with the best features and ease of use rather than be trapped using several different programs for each of the different formats with their own idiosyncrasies.
Recommended in order of preference:
1. FBREADER (Free) for Android allows you to read .epub format and few others too. <- EPUB is my favourite format and not co-incidentally its the native format the iPad uses too.
(I do trade epubs with my iPad using friends because: Real geeks don't fight over what flavour their e-penis is... really come now.)
2. Adobe PDF reader for Android (yes also depressingly so: Free too) for a VERY good / best reader for all your PDF files. (pr0n / graphic novels included)
3. The Kindle application for Android (also Free) allows one to buy and read books from Amazon's Kindle service.
Then there's a veritable VAST ocean of other ebook reading and such programs available on the Google market and the vast majority of which are all also depressingly free to use and abuse as desired.
Have fun!