I think improving the already existing (and fairly improvable) spellchecker is more important than adding a new one.
Adding missing features like "Replace All" (see feature request at http://bugzilla.lyx.org/show_bug.cgi?id=3914 ) would notably improve the workflow in LyX with, I dare say, much less effort than implementing on-the-fly spellchecking. Right now, I sometimes have to write the text in a separate editor and use LyX for formatting because correcting often-misspelled words (usual for non-native English speakers that get UK ad American spellings mixed up, for example) is quite awkward, time-consuming and error-prone. - Urtzi - -- Urtzi Jauregi Fakulteta za Matematiko in Fiziko, Univerza v Ljubljani Jadranska 19, Si-1000 Ljubljana Slovenija Tel: ++386 01 540 13 53 e-mail: [EMAIL PROTECTED]