7. A method according to claim 1 wherein the tags from the first selected candidate category in the proposed further tags are the most frequently used tags in the first selected candidate category and the at least one tag from the second selected candidate category in the further tags is the most frequently used tag in the second selected candidate category.
1. A method of electronic resource annotation comprising: receiving, for each of a plurality of categories of a resource, a category tag list of tags often applied to resources in that category; receiving, from a user who has reviewed the resource, one or more tags the user attributes to that resource; calculating on the basis of said one or more tags received from said user and said category tag lists, a degree of membership of the resource to each of said plurality of categories; selecting two or more candidate categories to which the resource has the highest degree of membership; and proposing, using a computer system including at least one computer processor, further tags in the category tag lists of said selected candidate categories to said user, the proposed further tags including tags from a first of the two or more selected candidate categories and at least one tag from a second of the two or more selected candidate categories, the resource having a higher degree of membership with respect to the first selected candidate category than to the second selected candidate category, and the proposed further tags including a number of tags from the first selected candidate category which is higher than a number of the at least one tag from the second selected candidate category.