To switch to the Swype keyboard, just touch a text field (to activate the keyboard) and then click the keyboard icon that appears next to the clock. A menu will pop up and Swype is one of the options.
A cool note about Swype on this tablet is that if you are used to it on an Android phone, you can shrink the size of it so that it takes up less real estate. Just tap the bottom right key on the Swype keyboard to shrink and stretch it (there are only two size options).
The Talk app is Google Talk. This is Google's instant messaging client. A nice thing about the Talk app on Honeycomb is that you can use the front facing camera for video chat.