Spellify is a nice Ajax powered spell checker for form fields. Spellify will make it easier for your visitors to spell check while filling the text fields.
Spellify is based on script.aculo.us/prototype Javascript library. You can easily include spellify in your web pages.
It suggests automatically if you misspell words in text fields, it shows correct words in a small box. Password fields are automatically ignored, you ca even specify if you want to ignore any text fields.
It works with major browsers like IE7, IE6, FF2, Opera 9 and Safari 3.
This is a much need utility, especially for entering the blog title.
@Nirmal
Yep this is quite useful