A.) Hand Over of Current / Live Projects
B.) Hand Over of Old / Finished Projects
C.) Transfer of Important Research and Knowledge update
D.) Important Enquiry and Well documented Enquiries / Probable Clients
E.) Design Resources and Development Resources / PDFs and eBooks, Important Blogs
F.) Important Application on iPhone and iPad
G.) Important Success Stories of Companies in Mobile
H.) Interesting Business Model and Strategies by Mobile Companies
I.) Internet Advertising, Mobile Advertising and Other Revenue stream for Mobile Apps
J.) Client Communication and Client Trust Building measures
K.) Enquiry Client Communication and Handling Enquiry, Sales Team
L.) Documentation , Code Review, SVN and Git Protocols
M.) Client Stories for each Existing and Old Clients, Blunders made with Client / How to avoid blunder Clients
N.) App Store ( Deployment, Distribution) - TestFlight, App Store Distribution, App Store Marketing , Enterprise Distribution
O.) One to One - Understanding the individual Team Member Potential and Interests
P.) Internal Projects and Products
Q.) Code Review Sessions
Why?
I can guarantee that the minute you walk out of the door, they will tear up anything that you wanted them to do. Whoever will replace you will want to do it their way, not yours, and that's all there is to it. Management are notoriously eager to stamp their authority when someone leaves, for good reasons as well as bad. No need to be overly romantic about any legacies!
Friendship and networks on the other are valuable so work on those as your priority.