You can also embed them into the post itself, something unique to trip report forums. Bear in mind some folks still live in the dark ages (dial-up ) and if the photos are large size and there are a large number then they will take an age to load.

Now the option is available I tend to post thumbnails of the images on here. See my trip report here http://www.flyertalk.com/forum/showthread.php?t=508004
I can highly recommend www.imageshack.us for hotlinking images as it is free, with unlimited bandwidth and is quite user friendly ^