Lingvosoft provides Bengali translation software for PocketPC. You can download trial versions, to see what works best for you. The software packages fall into these basic categories:

• Bengali Talking Dictionary (just under $50). This is what most people are looking for. Load this on your machine, and you have a virtual translation device. It delivers instant bi-directional translation of all the words and phrases in its massive database.
   

• Bengali Phrasebooks (just under $50). Have the power of 14,000 travel-oriented phrases at your fingertips! You can instantly translate in either direction, too. This software features advanced speech recognition and crystal-clear output of native-speaker voice narration.
   

• Bengali Picture Dictionary for Pocket PC (just under $40). The Ectaco KwikPoint program is an effective and easy to use system for getting your ideas across–silently! Featuring more than 600 universally recognized symbols, it helps you communicate in many different situations without speaking a single word. It  lets you communicate your needs concerning dining, lodging, transportation, and other commonly encountered situations with a minimum of effort. Simply select the picture you want and show it to your waiter, hotel clerk, bus driver, or even your new best friend. Providing essential travel tools for your personal and professional needs, it allows you to interact with the people you meet on your trip abroad and to be understood! Make new friends and enhance your travel experiences now with this user-friendly communication tool for the whole family! More info
   

• Bengali Flashcards (just under $40). These make studying and foreign language as easy and enjoyable as it should be. Featuring 5 enjoyable games that make learning fun, they are the most effective way to memorize thousands of new words. Just install this program on your computer, and you can begin  developing your command of a second language in record time. The  customizable interface allows you to choose from numerous options to make the experience the most comfortable possible.
   

• Bengali Suites (from just under $100 to just under $150). A suite equips you with advanced applications for all of your devices. Fully-integrated and compatible with the most popular MS Office applications (Word, Internet Explorer and Excel), it extends the functionality of your existing word processing and internet tools with the added benefit of instant translation.