Teacher Web 2.0 Tools at a Glance

After overwhelming myself with all of the tools available to classroom teachers at all levels, I decided to create a quick and simple chart to help teachers decide which tool to use based upon their classroom learning needs. Because many of the K-12 teachers I work with are at various levels of technology proficiency, and their needs may be quite different, how do they decide when to use a wiki or a blog or google docs? Please let me know what you think-this is my first draft.
SIMPLE WEB 2.0 TOOLS CHART

DELICIOUS/DIIGO	GOOGLE GROUPS Google Docs/Office Live	NING	TWITTER	WIKIS	BLOGS
organize and share bookmarks	Group Projects	social network for sharing ideas,conversations, resources	share ideas,resources,media 140 characters or less	share ideas, resources,media	Share ideas, resources with a specific audience
public or private	writing collaboratively	informal community with common interests	network	place to organize and share content	Receive feedback,commentary
can network,collaborate globally	organizing work,sharing information	personal profile-multiple members	public ,personal, or private-global	public or private-by invitation	authored by 1 person
	public or private-by invitation	by invitation	1 author	1 or more authors-collaborative	public or protected
	multiple members-collaborative environment