HNHSoft Talking English-Chinese Dictionary is a great dictionary for Chinese language students. It contains over 60,000+ entries, Pinyin (the official Chinese phonetic system), and most remarkably, a real person's pronunciation for every single Chinese word! The dictionary also provides a great study tool that allows you to organize your own list of words
Navita is a free five language translator for your Blackberry. Its similar to bbtrans also made with a very simple interface. I don't know what translation engine they are using but it seems to be okay and fast enough. My officemate claims the German translation works well and is usable
Random Application for BlackBerry 8310 (Curve) 4.5