Is there a way that the trust can make yearly payments to my wife instead of giving her a lump sum?
Yes.
You can set up your trust, so that when you die the 'income' (and/or some of the principle if you also want), can be used by your wife. When she dies, those original assets go to someone else (some nephews on your side of the family, a charity, me, etc). If you'd rather, you could set it up that the assets are held in a trust for xx years, and skip a generation and go to the grandchildren.
Read up further on trust's. If you are legal language inclined, you can read through a number of different types of trusts by purchasing a legal reference/templates manual. I've been very happy with ElderLaw Forms Manual, by Harry S. Margolis, published by Aspen Publishers. It's a very large, 2 volume set. It's pretty pricey, but if you do enough research with this manual, you will have enough knowledge to have some very productive discussions with a lawyer, and save hours of legal time. It also has all of the other forms you'd want to have built at the same time (wills, POA's, health care POA's, etc). It also has explanations, where it explains why certain paragraphs and phrases are put in, and what they achieve. It explains options, where it says thingts like: if you want to achieve A, put this language in. if you want to achieve B, put that language in.
Local lawyer will ensure your documents he creates comply w/state specific laws.
Oh, and I should mention.....for high valued estates to avoid taxes, you actually want to pass the assets on to someone else besides your spouse. If you let all of your assets go to her, then when she dies her combined higher assets could put her over the limit where they now get taxed. You effectively loose your exemption. I have some assets which are in trust for my kids (but could be anyone), where wife has access to the income generated while she's alive (5 and 5).