I Just noticed a small, useful feature, on G-mail- at the end of a message you can select to convert the message as a document. (Google Docs)
This makes it easy to go from an email containing minutes of meeting or something that you want to save, or do something with.
Once it is a Google doc you can then invite others to collaborate, publish on web, blog or wiki, download , or just save for later reference, etc.
A lot of people, and I'm guilty, currently save messages in e-mail format because we want to keep the message, contacts or attachments and view them again. This uses up lots of storage space and means you have multiple folders and programs to work with and search when you are looking for your own stuff. I'm like Google docs and how it works in sync,with G-mail.
On another Google Note Picasa for pictures also has built in GPS on Google earth so you can designate where photos are taken. Geo-tagging photos with Picasa and Google Earth
This may be useful for the traveler, geographer, photographer. I want to create a virtual tour for the Eramosa Karst Conservation area in my back yard so that will be a great (easy, free) tool. When I have it done I will let you know.