Jastrow’s Dictionary Online
While Marcus Jastrow’s English-Aramaic dictionary has been online for sometime, this version was in PDF format and divided into sections according to page number, making it not so useful for quick-reference. S.H. has posted to mail-Jewish about another version of Jastrow online here which I was previously unaware of. It is much easier to use and although the index doesn’t have every entry, it does have the first one on every page of the dictionary.