SlovoEd Spanish-English and English-Spanish VOX dictionary (more than 60,000 entries, dictionary database by Spes Editorial). Features: resident module (allows you to translate words right in the currently active application: just select any word in any application and choose 'translate' in the pop-up menu), search module (if you don't remember exact spelling of a word, enter any part of this word and start the search module), possibility to change dictionary with built-in editor: add new, remove, and edit entries, possibility to invoke dictionary anytime right from the active application by hardware button (choose in 'Preferences' dialog box).
Free to try
Pocket PC 2000
Windows Mobile 2003 Phone Edition
Pocket PC 2002
Windows Mobile 2003
Pocket PC/Pocket PC 2002, Windows Mobile 2003/2003 Phone Edition