Have just joined. Seems to be a great place to swap tips and learn lots. I’ve recently upgraded to a dslr Canon 40d and am looking forward to having some fun with it and learning as I go along.
hi maralyman, most images here are responded to well if they are 800 pixels on the longest side. If you upload to a web hosting site like flick or pix.ie then they will automatically resise pix for you (better to do it with some application on your computer though) then you can post the images here using the link to the photos on the hosting site.
I’ve used Flickr for my images almost from the start and find their upload tool to be excellent and so easy to use. You can choose the max size for your photograph before you upload it and then it gives you several size options to post on other forums once it is uploaded.
As already mentioned. 800×600 is the usual.
For an outline of general site guidelines on this subject have a look here.