I have recently moved many of our photos to Flickr. It required purchasing a pro account, which is about $25 per year. It has been great for storage and sharing. You can painlessly upload from and download to the iPad, but if you want to upload a lot of files at once, you might want to use the Laptop. Once this is done, routine maintenance and updates are easy from the iPad. I use Flickrstackr.
An interesting thing about using Flickr was it kinda forced me to clean up our photo collection. We have about 5,000 photos, which is probably not that much compared to some people. Anyway, as I went through the ones I really wanted to keep on Flickr the number wilted to about 500. Basically, I could lose 90% of the photos that I had on local disk and would never miss them. There are lots of duplicates, crummy photos, bad resolution, people not looking at the camera etc.. My habit was to just download them all from my camera or phone to the family computer. Now, I selectively upload the best ones to Flickr so the grandparent and friends can see them. I just don't worry about the rest.