Cooliris for Chrome. Shift-click any screenshot to zoom in into another window.
You may want to run Chrome with some extra arguments such as
C:\Users\Luboš\AppData\Local\Google\Chrome\Application\chrome.exe --lang=cs --enable-sync --enable-extensions --show-extensions-on-topClearly, the path should be replaced by yours. You won't need the lang=cs language option (I don't need it, either), and the other options may have become automatic or will become default very soon.
Chromeextensions.org seems to be the most serious website with collections of dozens if not a hundred of extensions at this moment. The official website for extensions, chrome.google.com/extensions, was initially open to developers who want to submit extensions only. However, it's now open, too! Google offers hundreds of extensions over there.
Extensions have gotten a pretty nice yet simple official page with the list where you can enable them, disable them, update them, or set the options. See also part 2 and part 3.
AccuWeather is an efficient way to see your local weather.
Feedly.com is a pretty gadget to generate a "journal" out of your favorite feeds.
Otherwise, the screenshots show a couple of other random extensions that were enabled in my Chrome at the moment. The red envelope "19" counts the number of unread Google messages. The blue up-arrow goes to the folder at the higher hierarchy (like "cd .." in DOS).
The blue "a" icon is "Aviary", a gadget that allows you to take screenshots and immediately edit them with a built-in photoshop. The green rotated square is Feedly, discussed above. The magnifying glass is a search engine with various adjustable search engines (this can be done via the omnibox, with keywords, without the magnifying glass). The blue-and-green squares are Cooliris.
The black disk is Pendule, giving you additional developer tools (such as viewing a page without CSS etc.). The Sun with clouds is AccuWeather. The following line starts with a notepad: it runs "sticky notes", a minimalistic text editor with a fixed file. The blue circle with a small magnifying glass is searching through the open tabs.
At any rate, it's pretty clear that if the missing plugin technology was a reason for the limited propagation of Chrome, this reason is already being evaporated.