Every year plenty of new and exciting garden books enter the market, but few are as timeless and consistently helpful as the Old Farmer's Almanac. This tried and true publication has been published annually since 1792 (without missing a year!) and consistently helps me keep track of what I need to get done and when in the garden.
Between the website and the actual book (which you can easily pick up on nearly every grocery store's periodical stand across the country for $6.99) there is a plethora of advice and useful tips. This book is so ubiquitous that I bet you might not have even noticed how readily available it is (everywhere!).
Currently I am using the winter and early spring checklists for shrub and tree pruning — I don't know of a more practical set of lists than these — and I am gathering inspiration from the huge selection of online vegetable garden plans to help me flush out the details of this year's vegetable patch. There honestly isn't a better deal for the price — plus you get the weather forecasts (which are notoriously accurate). If you are trying to get back to the basics this spring, I highly recommend starting with the almanac.