This quick-reference dictionary features approx. 50,000 entries in each direction. In addition, the dictionary bundle includes BEIKS Dictionary Reader Pro, which allows additional entries to be easily added when necessary.

BONUS: ordering this bundle now, you will also get Monolingual English Doctionary /Gold/ with over 35,000 unique words in 2 MB file for FREE.

English to Japanese dictionary features:

Over 90,000 Japanese translations to about 57,750 English words in 706 kB file
Excellent data compression
Expandable with the huge selection of other BEIKS Dictionary Reader compatible dictionaries.
Download availability online
For faster download, the downloadable demo lexicon contains only words starting with A, B and C, but should give good idea on the quality of the dictionary.
Free software updates*

Japanese to English dictionary features:

Over 90,000 English translations to about 50,000 Japanese words in 660 kB file
Excellent data compression
Expandable with the huge selection of other BEIKS Dictionary Reader compatible dictionaries.
Download availability online
For faster download, the downloadable demo lexicon contains only words starting with A, B and C, but should give good idea on the quality of the dictionary.
Free software updates*

*Conditions apply: there might be commercial updates too, depending on the related upgrade costs to BEIKS; all upgrades from 1.0 to 5.7 were free and we will do our best to keep the tradition.

BEIKS Dictionary Reader features:

Specialized for reference content (dictionaries), resulting in simplified interface and improved speed
Available on other mobile platforms (Windows CE / Pocket PC, Linux / Sharp Zaurus)
Tested on the whole family of Palm OS® devices, up to and including Palm OS 5.x (CLIE NX/NZ/UX series, Palm Tungsten T2, T3 series, Treo 600)
Hundreds of language, specialized and entertainment dictionaries and phrasebooks, including free ones; if you can't find your dictionary let us know!
Dictionary browsing with dynamic word positioning
True support for MMC, SD, MS external media cards through VFS
Adjustable font sizes
Horizontal / Vertical views
Smart view
Most recently words list
Word of the day
Rich documentation

Most popular BEIKS dictionaries:

English dictionaries

English Dictionary Pro
English Dictionary Gold
English Heritage Bundle

Spanish dictionaries

English<->Spanish
Spanish Synonyms
Monolingual Spanish

German dictionaries

English<->German
German<->Spanish
German<->French