BlueDict is a powerful dictionary which is fully compatible with MDict data format the best one on Windows Mobile platform.
HTML Images Text-to-Speech audio recordings css are also supported.
BlueDict provides an interface for Google Search & ColorDict. E-books Reader like Moon+ Reader pro ezpdf reader can use BlueDict as its inner searching Dictionary.
NOTES: Just like many other third-party apps BlueDict is only a database "reader". So you need to get the databases then put them into /sdcard/BlueDict/Dicts or your specified path.