I've seen this poem floating around for quite a few years. Depending on which website you refer to, it was written by either Jerrold H. Zar, Margo Roark, Martha Snow, Bridgid Patrick, or Anonymous. If you have more definite information I'd appreciate if you'd share it so I can attribute appropriately.
Eye Halve a Spelling Chequer
I have a spelling checker.
It came with my pea sea.
It plane lee marks four my revue
Miss steaks aye can knot sea.
Eye strike a key and type a word
and weight four it to say
weather eye am wrong oar write;
it shows me strait a weigh.
As soon as a mist ache is maid
it nose bee fore two long,
and eye can put the error rite;
it's rare lea ever wrong.
Eye ran this poem wright threw it,
Your sure reel glad two no.
Its vary polished in it's weigh.
My checker tolled me sew.
Sow ewe can sea why aye dew prays
such soft wear four pea seas,
and why eye mussed brake in two verse
buy which eye hope too pleas.
A checker is a bless sing,
It freeze yew lodes of thyme.
It helps me right awl stiles two reed,
And aides me when I rime.
Each frays come posed up on my screen
eye trussed too bee a joule.
The checker pours o'er every word
To cheque sum spelling rule.
And now bee cause my spelling
Is checked with such grate flair,
Their are no fault's with in my cite,
Of nun eye am a ware.
Beecuz uv yoosing chequers
hour spelling mite decline,
and if we're lacks oar have a laps,
we wood bee maid too wine.
To rite with care is quite a feet
Of witch won should be proud,
And wee mussed dew the best wee can,
Sew flaw's are knot aloud.
Five years ago: Don't Let The Bedbugs Bite