ASP 101 - Using the Google APIs to Spell Check:
"The Developers at Google have been kind enough to offer a web API for developers using the SOAP protocol. When you do a search using Google, you may have noticed that you are prompted with possible alternatives to any words you may have misspelled.

The Google web API 'spell check' allows you to send a string of text and receive alternatives for misspelled words. The power in this web API is that the Google dictionary includes technology words that are used in website searches, but may not have been included in a Standard English dictionary. "

Setting up the Google SDK on your server is as simple as downloading the API from http://www.google.com/apis/. You'll need to register with the website which will give you your own key. You'll need the key for Google to accept SOAP connections from your server.

There are some limitations to be mentioned as well. The Google web API allows 10 words to be sent at a time and a limit of 1000 connections per key per day. The following script works around the 10 word limit, however is still limited by the 1000 connections.…

http://www.asp101.com/articles/jeremy/googlespell/default.asp