The old pattern was too broad and was making VIM ignore Scheme (*.scm) files.
Now it only matches files that start with . or _.

.*.s[a-w][a-z] matches named swap files.
.s[a-w][a-z] matches unnamed swap files.

Because files and directories starting with a `.` are not ignored in general.

Vim creates buffer swapfiles starting at .swp for buffers that are
active but untitled and unsaved.

Changed line matching vim swapfiles to use all names it will create as described in http://vimdoc.sourceforge.net/htmldoc/recover.html#E326

See http://en.wikipedia.org/wiki/Windows_thumbnail_cache#Thumbs.db

It contains project specific configuration, and should therefore by
checked into version control (as documented on
http://www.sublimetext.com/docs/2/projects.html)

Include .netrwhist, the user's history and potential privacy concern. See: http://stackoverflow.com/questions/9850360/

Including mexglx, mexa64, mexmaci64, mexw32 & mex64 (see
http://sfwn.in/FxbE for official list from Mathworks).

Org-mode stores archived TODOs from todo.org into todo.org_archive. It also
creates .org-id-locations in some cases.