I love Avery Easy Peel Return address labels, they are well made, easy to use, and multi-purpose: you can also use them to label your CD's, DVD's, folders and files and a whole lot more. This new larger size (2/3" x 1 3/4") allows you to easily fit four lines on a label, with still enough white space left around the edges.
One pack contains 25 sheets with labels, 1, 500 labels total. The labels can be printed out on both laser and inkjet printer. Avery guarantees that they are smudge free and jam free, which I found to be true: I have printed out a bunch to label some CD's, and I never had any smudging or paper jams. When printed, the labels are easily peeled off.
As for template, Avery offers free templates online (Avery.com/wizard), and it is even stated on the box which one you need for these labels: #8195 for Microsoft Word - very convenient.