The PC (Windows, Linux, Mac) version is free -> goldendict.org

Android free version, aviable to download -> market.android.com/details?id=mobi.goldendict.android.free
Android paid version, unlimited dictionaries -> market.android.com/details?id=mobi.goldendict.android

Download all dictionaries for free in all laguanges, huge list (needs forum registration) -> forum.ru-board.com/topic.cgi?forum=93&topic=2618
Direct download for a few in english, small list (no registration needed) -> traduko.lib.ru/dics_en_en.html

If you don't know it, this is the best dictionary program for Windows, Linux, Mac... and now Android!. You can have all them installed under the same interface (offline, copied to the sdcard): Oxford, Merriam-Webster, Britannica, Wordnet... and multi laguange translation dictionaries too. It supports image and video files, and sound pronunciations (real wav files and speech synth). Just search a word and you get the results for every dictionary installed. It also supports wikipedia and online dictionaries.

GoldenDict is a multi-format dictionary program with reach formatting, colors, images and sounds. It fully supports a lot of popular dictionary formats. You can now carry all the dictionaries you want together with you on your Android device!

Supported formats:

* Lingoes .LD2 files
* Babylon .BGL files
* ABBYY Lingvo .LSD, .DSL, .LSA and .DAT files
* StarDict files
* Dictd files

Just copy those files on your SD card, in the GoldenDict directory!
Please post the full version wich supports more than 5 dictionaries, if you can get it. Thanks