you can run the blackberry 8800 version of Yahoo Go on your 8300. so far it seems to run fine.

the problem is bypassing the part of website that determines what kind of phone you have. you can skip straight to the 8800 OTA download using this URL on your blackberry:
http://tinyurl.com/3xfkme

i didn't see any way to upload photos from the camera to flickr, hopefully it'll be in the official 8300 version.

enjoy.