Canola (at least for the n810) has the functionality to display photostreams / photo blogs. IIRC there are 4 or 5 streams preinstalled and you can add additional ones (rss feed) in the settings. I think this was originally intended for flickr and picasa streams. Yet, up to now I wasn't able to add a new one.

To make it short. Canola might be the answer to your question. And if you make it work, please tell me how ;)

icke


//Edit// I just realized that Canola is not available on the n900. But as you own a n800 and a n810 you might want to use your n900 just for tethering ^^