Slideflickr is a straight forward slideshow service to use with flickr, easy to create but with powerful settings to use.
You can adjust from what/where in your flickr photostream you want it to make the slideshow (tag, sets, favorites or all), and you can add your custom logo,text,color background, soundtrack and of course size.
If you are on flickr, it is worth a try
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Been using Slideflickr and like it, but have no clue how to mod it out a bit, as suggested above: ‘ and you can add your custom logo,text,color background, soundtrack and of course size.’ How do I do that? Any link to a how to?