Remember 100 files instead of 50 for virtual buffers (because 50 is *so* 2012).
Start using Eldoc
A lot of third-party packages use Common Lisp functions, so make those available.
Add basic configuration for yasnippet.
Don't delete trailing whitespace when saving files in eclim-mode: For
completion purposes, this mode is configured to auto-save after every
key stroke (self-insert-command), so if delete-trailing-whitespace
runs on every save, it becomes impossible to enter any whitespace.
Test-drive dired-details