I've noticed an increase in people "having to" change what they want to enter in their posts because they get beaten by the spellchecker.
Below is a c&p from the confirm page (the one that details your spelling errors) which you must pass through before contributing to any thread.
In other words, you don't need to be beaten by the spellchecker...
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If the spell checker is mistaken, don't panic -- as long as the fraction of mis-spelled words is less than 0.15, you'll be fine. Hints:
English capitalization is important: "Monday" is correct, but "monday" is not.
A note about names: CB users are recognized if you uniquely identify them in at least 4 letters. So, 'val' is not recognized as 'Valgasu', but 'valg' is. However, if there is also a user named 'Valgrind', you would have to type more.
If all else fails, use <nospellcheck> tags to 'opt out' part of your post from spellcheck. (Choose HTML mode and simply write <nospellcheck>...my text...</nospellcheck>.)
Ignoring this advice and simply padding your post with extra words to get above the 0.15 threshold without an exceptionally good reason will result in a fine.