Have a written work on your hands you can't even identify for translation purposes? LangId analyses a snippet of the text and tells you what language it is written in.
You can input text into LangId in a multiple ways. The screenshot above shows the results from simply cutting and pasting text into the dialog box. You can also upload a DOC, PDF, or XLS file for analysis, send the (short) text to LangId via Twitter, or email the document to them for an automatic reply.
LangId is a free service, requires no signup, and can identify 85 languages.