Galaxy Tab has a interesting feature that allows Accessing Picasa Web Pictures Offline. To do this just simple go to Gallery.
Now in your Gallery click on ‘All Albums’ and you would be seeing your camera pictures, screen captures and Picasa web album integrated. The photos from Picasa Web album are easily recognized with the Picasa logo shown on the album name.0
Tap on the top right corner and among the available options choose ‘Make available offline‘.

Once you have done that you would see ‘pin point‘ on each album cover image.

Now tap on each pin point to save the copy of those images on to your Galaxy TAB. As soon as you tap on the icon the image would be caching on to your tablet. You can select as many album as you want and a copy of all those picture would be saved on to your Galaxy TAB internal memory.