I was recently looking for a quick (and easy for the user) way to pull an album in from a Flickr account to a Kentico-powered web site and came across a Blogger Template post on embedding Flickr slideshows into Blogger Blogs - with a little tweaking, I've adapted the code to create a Kentico Web Part which enables the user to drop the web part on the page and feed it the 'Set ID' of the Flickr photo set, which is then embedded as a Flash slideshow.
The web part creates an IFRAME on the page at the dimensions specified in the web part properties. The IFRAME then pulls in the Flickr flash slideshow movie, feeding it a Set ID, again provided by the user in the web part properties.

Installation and Configuration
1. Download the Flickr Slideshow web part for free from the Kentico Marketplace;
2. Once you've downloaded the web part archive file, move/copy it to the ~/CMSSiteUtils/Import folder under the root of your Kentico site;
3. Login into CMS Site Manager and from the Sites tab, choose the Import Site or objects option;
4. The flickslideshow.zip file should now appear in the Import Packages list (see screenshot). Select it, ensure that the Preselect all items option is checked, then click Next. Click Next through the import options until the import process is finished;
5. Once the import process is finished, you can add the Flickr Slideshow web part to any of your pages as per any other Kentico web part. It will appear in the 'Community Services' folder of the web part selection dialog (see screenshot);
6. Once you've added the web part to a page, the web part properties dialog will appear. The Flickr Slideshow web part supports all standard Kentico web part properties, though there are 3 additional properties that you need to complete under the Flickr Slideshow Properties section (see screenshot):
Slideshow Width: The width in pixels that the slideshow window will consume on the page
Slideshow Height: The width in pixels that the slideshow window will consume on the page
Flickr Photo Set ID: The Set ID for any Flickr photo set. You can find the Set ID of a photoset by looking at the URL... for the URL http://www.flickr.com/.../sets/72157622703032999, the Set ID is 72157622703032999;
7. Once your Flickr Slideshow has been embedded, you can hover over the top over the slideshow to change the speed of the slideshow, or hover over the bottom of the slideshow to jump between photos in the set.
Notes and Issues
In order to view the slideshow, the user must have Adobe Flash Player installed.
The Flash Slideshow player is provided by Flickr; the service could be removed/amended at any time.