Can we get Firefox-like inline spell checking in Internet Explorer?
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IE7Pro includes Tabbed Browsing Management, Spell Check, Inline Search, Super Drag Drop, Crash Recovery, Proxy Switcher, Mouse Gesture, Tab History Browser, Web Accelerator, User Agent Switcher, Webpage Capturer, AD Blocker, Flash Block, Greasemonkey like User Scripts platform, User Plug-ins, MiniDM, Google sponsored search,IE Faster and many more power packed features. You can customize not just Internet Explorer, but even your favorite website according to your need and taste using IE7Pro.
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IEToys is freeware and works with IE6, 7 and 8.
I just downloaded and started using Speckie.
It does inline spell checking (and only inline spell checking), which I like because I don't want other stuff that I don't use.
I like it, it does exactly what it says it does.
Works for my Internet Explorer 9 running on Windows 7 Ultimate (they also support IE8 and IE7 compatibility)
There is no way to get it to work natively without a third-party application. I'd use Enso Words for this kind of thing; it allows you to use spellcheck from any program. Watch the videos to see it in action.