I found this online pali dictionary which I find quite useful:
http://www.dicts.info/dictionary.php?l1=English&l2=Pali&word=%C4%81t%C4%81p%C4%AB+&Search=Search

It's English-pali, also pali-english . I don't have to switch modes, I
can just cut and paste a unicode pali word (with diacritics), or type in
an english word and it will look it up. This is something that I hope
catches on for international dictionaries, including pali.

If you want to be really impressed with what a dictionary can do, check
out this bad boy:

http://www.mdbg.net/chindict/chindict.php?page=worddict&wdrst=1&wdqb=bodhisattva

(it's a chinese-english, english-chinese, pinyin, batch word lookup
converter all built into one)

I can search for :
bodhisattva
or 薩 ,
or "pu2 sa4" (pin yin phonetic spelling with tones)
traditional chinese character or mainland simplified character

without having to navigate any menus to switch between pinyin,
chinese->english, english->chinese.
Just type in whatever you want to search for or cut and paste into the
search box and it goes and finds what you want.

If you look at the web page for "bodhisattva" that I linked above, each
word has 6 icons for further detailed info about the word. There's a
speaker icon, which will play a sound file of how to pronounce the
word(s) (or phrase), an icon to pull up a google search, an icon that
pulls up a list of sample sentences using that word, the icon magnifying
glass will show you the etymology of bodhisattva, that is, the chinese
薩 is a transliteration of the "satt" in bodhisattva.

Eventually all international dictionaries are going to figure out this
is a good way to do things. For the pali world, this would be like DPR
integrating Lennart's translation tool, the world tipitaka audio
dictionary all rolled up into one simple tool. without having to dial
knobs or switches to get it to understand what you want. You just type
in "ātāpī" or "aataapii" or "strenous" and it goes and looks it up, and
plays an audio file with perfect pali pronunciation, shows the etymology
of the word, synonyms, antonyms, sample sentences, shows a picture of
mahakassapa or a non-smiling mahasi-style monk looking serious about
their practice :)