A lot of people think "oops" is spelled "opps"... then there's "I minus (might as) well".. then there's "all intensive purposes"... hrm... immigrate/emigrate, to/too/two, import/export, download when meaning upload (big with the computer illiterati, many consider doing *anything* with a computer to be "downloading" ("I just downloaded the modem to the internet"), and make sure to say it constantly as they think it makes them look smart), any others?
Anyway it doesn't bother me, though I do notice it. Wut, u, ur, b, r, ne1, plz, thx, y, c, 2, 4... these are what make me consider murder.
Oh - and "it's" = it is. "its" = possessive