Mer/Documentation/First Steps
Here are some ideas to help you get some useful things running on Mer. They can all be installed via apt-get install
Sound
Sound currently (0.12) only works with alsa, not pulseaudio so:
apt-get install alsa-base
gnome-alsamixer works as a volume control
For music playback try xfmedia with xine-backend it uses the least cpu and supports playlists.
Video
dragonplayer, plays videos.
Internet
Of course, midori is already present but you may want to try arora, another browser.
For IRC try Xchat