The cucumber didn't really illustrate the concept of full-size images very well.
As the attached screens show, resizing a comic to a thumbnail makes it too fuzzy to be readable, but in full-size form it's perfectly sharp. I also attached an example SXL with Dilbert and D.C. preconfigured.
You can get much more comics feeds here:
http://www.tapestrycomics.com/
The SXL also shows off the capability to save feeds and output only new feed items. (To achieve this, Sunrise XP compares the previously saved feed items with those from the feed on the server, much like a regular news aggregator does.) The result is that you only get the newest comic(s) since the last update.
To prevent overwriting any existing, unread comics the Plucker document is date-stamped. I.e. "Dilbert 060206", "Dilbert 060207", "Dilbert 060208". (The date stamp can be configured by clicking the ellipsis button next to Name field in Document Properties.)