Out in the field, we are often tempted to do that late winter pruning as these January days hover in the 40's to low 50's. But hold back the pruners a bit from things like the Red-twig dogwood and Cotinus and don't go whacking that Miscanthus grass down quite yet. The swing from freeze to thaw and back are inevitable. Some selective cuts can be made, but the big work should be done in a month.
The other day, one of our landscape crew-leads was hovered over a few seed catalogs with highlighter and pencil in hand making some decisions about her spring vegetable garden. Despite what some may think, I've been reminded that early to mid January is the prime time to be purchasing (in store or on-line etc) those seeds that you'll want to have growing in April. If you want to do some veggie gardening, now is the time, especially if you are going to be one of the ambitious ones and start them in-doors. Many early vegetables need to be started in mid-february. So get started!