Some typos have such poetic charm that it seems a pity to correct them. Here are some that I have regretfully undone in my years as a copyeditor:

arbitrariety
foolhearty
notwisthstanding
errorful
contraddictions
the drivial case
cluttter
interatively
    (One of those portmanteau typos, like the notorious manimum &
    miximum.)
helpful and inciteful comments
propergation
integarble
pnuemonics
inexectricably
illucidate
anomality
Collorally
infinimum
arbitrarility
charasteristic
accuracity
stepwisely
Concludingly,...
successless
removement
irrregular
irregularer
disturbation
blobules