Strictly as a note to myself, because I’ll never remember this on its own …
:s/\<\(\w\)\(\w*\)\>/\u\1\L\2/g
That will convert a line of text to Title Case in vim, either on the line it’s issued or over selected blocks.
vim has single-key case conversion anyway (the tilde key) but this might be the quickest way to arbitrarily switch everything to title case.
Not my discovery or idea; found by way of the Vim Tips Wiki.
Motho ke motho ka botho 
Bonus tip: record a macro to do this with a single key combo.
To be honest, I’d rather just do: ~w.w.w.w.w.w.w […]
It’s easier for me to mash the w and . keys than it is to find and copy in that regex monstrosity.