HTC DROID Incredible - Manual (Page 227)

Gallery 
If there are photos or videos under the root path of your storage card
(that are not contained in folders), they will be grouped under the
Other album.
Viewing photos and videos
After selecting an album from the Gallery application’s Albums screen,
you can browse through the photos and videos of that album either in
filmstrip or grid view. Tap a photo or video to view it in full screen.
Browsing in filmstrip or grid view
By default, photos and videos are presented in a horizontal filmstrip.
Slide your finger left or right across the filmstrip to go through the
photos and videos.
From the filmstrip view, press MENU and then tap Grid view to browse
photos and videos by thumbnails. Slide your finger up or down to
scroll through the thumbnails.