Hi warpig, this is a great time of year isn't it? All the little birdies are busy in my garden collecting nesting material, it is wonderful to watch. It depends on where you live in the country, but some birds you may see in your garden are house sparrow, blue tit, great tit, chaffinch, greenfinch, robin, blackbird, wren and starling. This website
http://www.garden-birds.co.uk/ could be a good starting place for identification, also the RSPB website.
http://www.rspb.org.uk/gardens/ Enjoy watching those birds!