I am sure this must have already been in Kovid's development plan, but Content Server's browser reader have a rather simple search tool comparing to Calibre's native E-book viewer. In Content Server's search, there is not a separated panel for the results, which makes it lack the ability to show previews. To find results, one will have to go through all results one by one, and there is no way to go back to last position when searching is done. I think search is an important and frequently used tool for any serious reader, so here I am to let Kovid know that I am looking forward to its implementation.
To be clear, here are 2 screenshots to show the difference between Calibre's native viewer and Content Server's: