Here's what is on my TODO queue without any special order:

• add Recent File menu item
• add Workspace concept; where you can edit several simultaneous files on separate tabs
• add a nice Wizard to split GSI files into smaller chunks that can be distribuited by contribuitors of a L10N project
• CVS integration. Yes, that's right :-) I reckon that CVS management of GSI files is a very usefull feature :-)
• add text search/replacement capabilities - I guess this will be the next one i'll work on
• include a nice little auto-translation feature that i'll call "Google-it!" :-)
  Basically, it'll use Google's Language tools to translate text when possible
• add some artwork - this has the lowest priority
• uhhh, create translation mini-framework. isn't it ironic? this is a tool to translate resource strings of an office suite but it cannot be translated itself
• include support to translate XML Help Files
• allow text search to find a GroupID/Local ID pair