What do you use for pdf annotation and citation management? I really like hosting my own data with zotero+webdav, but there basically is no interface. On the flip side, Mendeley has a ton of features, and works+looks great, but hosting is paid.
Grabbing parts of a book out into the workspace is easy, and then you can quickly review your workspace of highlights and notes later for a refresher. Also, viewing two places in a single PDF is as easy as tapping and holding on two highlights in the workspace.
Also would recommend, if you want paid hosting, pay for a Zotero account with extra storage (run an academic group at George Mason University, aka the good guys). Don’t give money to Mendeley which is owned by Elsevier (definitely the bad guys).