For what it's worth, I personally choose to err on the side of caution on this issue. While I will on occasion work with non-Jewish entities, I do avoid gods associated with enemies of the Jews (Egyptian, Sumerian and other Near Eastern pantheons) since those are the ones we were specifically forbidden from dealing with in ancient times. And my worship is reserved for YHVH alone... other mostly-dead gods should be glad someone's speaking their name at all, even if they're not getting actual worship out of the deal. I do know Jewish pagans, though, and I think that much as it's good for me to know how being gay and Jewish can work halachically, it's important for them to know how being pagan and Jewish can likewise work within the context of Jewish law.
Up until the medieval period there were still plenty of Jews - even some rabbis - who felt practical kabbalah was nothing to be ashamed of. In their works, we find that "kosher magic" means magic that deals in three things - biblical verses, angelic names, and/or names of God. Intent is still important also, of course, but that's more of a prerequisite - an angel is not going to help you cheat or steal in the first place.
Un-kosher (treif) magic is the opposite: magic that involves foreign gods (except perhaps under the circumstances laid out above), "evil" spirits such as demons or shedim, or practices specifically forbidden by Torah - specific kinds of necromancy, divination, or temple prostitution, for example. I like to refer to all other magic as parve, which is to say "neither specifically kosher nor un-kosher". My personal favorite kind of parve magic is chaos magic, since it easily works without the use of gods, angels or demons of any kind, and since it can optionally involve invocation of fictional characters. Depending on focus and exactly how the rituals are written, though, ceremonial magic or wicca could also be considered parve magic. (Since many original members of the Golden Dawn and OTO were Jews, it's not too surprising that much of ceremonial magic is specifically kosher rather than parve - the Lesser Banishing Ritual of the Pentagram being the obvious example.)
Sefer Shimmush Tehillim - The Book of the Uses of the Psalms. Includes kosher uses (and some not-so-kosher ones, intent-wise) for every single one of the psalms.
Hebrew Names of God - Not sure who exactly this site belongs to, but his list is comprehensive and accurate.
Angel Names and Meanings - This site isn't bad, but "A Dictionary of Angels" (on the right, under "Books on Jewish Magic & Mysticism) is way better.