Whenever a new Audio CD is inserted, information about the CD is automatically looked up in the Freedb database and appears in the CD node in My Computer. If there's a direct match to your CD, the information will automatically appear, and if there are multiple matches, you'll be prompted to select the correct Album from several options. To requery the Freedb database, simply click Tools > Get Album Info from Freedb (this only works when a CD is inserted).
If a new Data CD (containing MP3s) is inserted, you'll be prompted to manually identify the CD with a 'label'.
If you have tracks that are missing information or Album Art, you can lookup and import the missing information by clicking Tools > Auto-Tag from Web. By default, this will return Albums from Amazon that contain the Artist, Album, and Title information in your tracks (without sending any personal information to Amazon). In the future, plugins will be made available that allow you to lookup information from other sources.
Once you've located a relevant Album:
By clicking the Options button you can configure:
If you have tracks that are still missing information (for example 'Year' information is sometimes missing from Amazon), click the web node, to access several databases containing information about 1000's of tracks.