The COLLINS GEM LATIN DICTIONARY is a superb little dictionary that is superior to even other language dictionaries in the Collins Gem series. It is both a Latin - English and English - Latin dictionary, and includes several appendices on terminology of Roman cultural matters.
The Latin-English portion contains nearly all words the high school student or undergrad are likely to come across. It is followed by a brief summary of Latin grammar and verse. The grammar is sufficient only for students of the most basic level of competency in Latin, but the explanation of verse is insightful and will satisfy even higher-level students. The appendix of place-names in Latin and their equivalents in English is a godsend for students who can handle texts just fine except for place-names which are missing from many larger resources.
One caveat is that the dictionary seems a little too large if one is not going to be using the English - Latin section. High school students, and university students taking a course in Latin composition will find this section most helpful. Those whose use of a Latin dictionary is limited to deciphering problematic words in an otherwise clearly readable text will find an entire half of the dictionary to be unnecessary and may resent the larger size of what could be an ideally compact dictionary.
For beginning students of Latin, the COLLINS GEM LATIN DICTIONARY is the dictionary to get. It is not ideal for higher level study, but students with a few years of experience should have already invested in a copy of LEWIS & SHORT'S LATIN DICTIONARY.