Key

=Screamingly Easy

=Not difficult, but can be time consuming

=Difficult

=Requires you to make account

=Firefox add-on

=Click for example
Kwout-"Quote" images from webpages that link to that webpage. 
Itty Bitty Browser-Embed browser within page so that you never leave during research.
Google Forms-Embed docs, presentations, calendars, forms, etc.
Google Calendars-Embed docs, presentations, calendars, forms, etc.
Google Presentations-Embed docs, presentations, calendars, forms, etc.
Google Search Box-Embed a Google Search box on your page.
Google Gadgets-Many, many widgets here.
Voicethread-Embed a Voicethread (which is an audio guided presentation).
Dipity-Embed an interactive timeline of your own creation.
Shelfari-Embed a virtual shelf of books that you like.
Library Thing-Catalog your classroom library and embed a search box on your page.
Scholastic Book Wizard-Find Lexile levels of books.
Tiny URL-Embed a little widget that makes long URL's tiny.
Prezi-Embed a non-linear presentation. 
Teachertube-Upload and embed your own video content or embed content of others. 
Schooltube-Upload and embed your own video content or embed content of others. 
GCast-Create your own podcast and embed a podcast player on your page. 
Mixbook-Create and embed your own embeddable book. Works well with Picasa pics.