I edit a great deal of text in Geany, and one the main reasons I use it is the lack of interference as I write.
But I am human, and as such, I often keep an empty AbiWord window open in order to check the spelling of words I am unsure of.
It would be beyond awesome to have some sort of dictionary/thesaurus/spellchecker widget available?
I have no clue how to create such a thing, but it would be godsend.
I don't know if this would be useful for anyone else, but it seems like it could be.