One option for you
Opera 7.50 PREVIEW release This is NOT a final release
2 notes
1. They've changed the GUI quite a bit, so I wouldn't go installing over your current version just yet. Install it into a seperate folder until you decide if you want to keep it.
2.
Quote:
Spelling checker *
Opera now has the ability to work seemlessly with external spelling checkers, such as Aspell (http://aspell.net/). The Windows installer and quite a few dictionaries are available at http://aspell.net/win32/ (you need to download both the installer and at least one dictionary for Aspell to work). The spelling checker works in Opera Mail compose windows and multi-line form inputs. After installing Aspell, just restart Opera and it should be detected automatically. Aspell is free and open source. Opera will define a public API (based on unicode/utf-8) and will release source code for an example implementation hooking up to Aspell, so other spelling checkers can eventually work with Opera.
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Enjoy

Let me know how it works, I don't use spell checkers so I don't know.
The updated GUI takes a little getting used to, check out the opera forums if you want to find out more about it.