I would be very keen to see new 32 and 64bit spell checker plugins based on Hunspell (see http://hunspell.sourceforge.net/). Hunspell is the default spell checker of OpenOffice, Mozilla Firefox 3 & Thunderbird, and at the moment there are dictionaries for 96 languages (see http://wiki.services.openoffice.org/wiki/Dictionaries).

I examined the UK English version of the current 32bit spell checker plugin and noticed that it is based on the rather old Sentry Spelling-Checker Engine from Wintree Software (the sse5332.dll dates from 04/10/2000). Hunspell is way more modern and flexible.

There is some work on the combination of scite and hunspell (see http://sourceforge.net/projects/scihun/) and the result is not bad.

Given the excellent support for different encodings within EmEditor, it would be very nice to have a modern spell-checker that can work with any language that is available for OpenOffice and Firefox.