With the new site, there's a new tag specifically for marking spoiler text.
No longer do you need to quote "white on white" text, or leave big gaps, simply put the text you want marking as spoilers inside the following tags...
and that's it!
[spoiler]This is spoiler text.[/spoiler]
Also, you can now easily "multi-quote" a number of posts by clicking on the "+ icon in the bottom right corner of the relevant posts (turns into a + with a tick); then when you click on the +Reply to Thread button, all the checked posts will be quoted in your reply.
A button on the "Go Advanced" message editor allows you to link to MP3 files with a small audio player.
Simply type in the web address of the MP3, highlight it with your cursor and hit the MP3 button. Then when posted you'll see a "Player" icon and clicking on that will launch a pop-up window to play the audio.
Every 60 seconds the site will automatically save the content of your message (/reply) box. If for some reason you're not able to complete your message then the next time you come back to the thread and begin making a new post you should see a "Restore Auto-Saved Content" button in the bottom left corner of the message window.
Losing text happens rarely but this should be a handy feature just in case.
Hope these are of use!