The hypertext version of Plumley’s Coptic Grammar has been updated and a downloadable version in MS Word added. Both can be found from the link above. Thanks to Mark Goodacre at New Testament Gateway for alerting me to this.
Like Mark, I prefer to use Lambin as my basic Coptic text, but I find that Plumley is sometimes useful for providing another way of looking at the meaning of particular grammatical structures and the electronic version has the advantage of being accessibly when the paper version is in my other office. I also find Ariel Shisha-Halevy’s Coptic Grammatical Chrestomathy useful from time to time because it has a number of tables in the appendices that summarise Coptic grammatical forms. I am not as optimistic as the author about the possibility of teaching oneself Coptic using this book, though, and it is often very expensive. At the time of posting the link above, Eisenbraun’s was offering it for USD 52.25, but it is often well over USD 100.
Eisenbraun’s also offer Richard Smith’s A Concise Coptic-English Lexicon at a very reasonable price (USD 17.96). I find this little book very useful for quick reference, both because it does not use the ornate font that is used in Crum’s and also because he doesn’t give examples, so it is easier to find vocabulary items than it is in Crum. For distinguishing fine shades of meaning, there is no substitute for Crum, of course.
Another useful set of Coptic resources can be found on Lance Eccles’ Macquarie University-based site. He includes outlines of both Sahidic and Bohairic morphology and a short classified Sahidic vocabularly with examples. The latter is very useful when you find yourself asking “Now, what is the Coptic for ‘forearm’, again?” and don’t feel like wading through the English index in the back of Crum.
Update 3 May:
I have just discovered that the links to Eisenbraun’s catalogue don’t work properly, so I’ve simply linked to their website and you will have to put some keywords into the search box to find the books.