Ooh some good ones there, thought of some more:
The good:
When you're having a nightmare day at work, feeling your baby kick you can make it all better.
Your priorities can change drastically and you may suddenly realise that your job is a load of horlicks. Your boss, though horrible, seems less frightening.
Mentioned before, but I'll say it again: those dreams.
You'll be surprised at the feeling of achievement you get from doing a big poo!
The bad:
"Are you sure it's not twins?" isn't that funny the first time; it soon becomes really annoying.
Your colleagues will assume "morning" sickness means just that and will think you're skivving when you go home vomiting in the middle of the day.
You will want to lamp the next person who asks you if you've tried ginger / if you're using the right type of ginger for your ms.
You might never "bloom".
The tiredness doesn't just last for the first twelve weeks even though your dh/dp/colleagues think it will.
Chemists will refuse point blank to sell you certain medicines even if the NHS Direct advert says its safe in pgcy (unless you have a prescription).
You mightn't get any cravings, or get really boring ones (sparkling water, anyone? how dull!)
The ugly:
Prune juice tastes rank!
Cleaning your teeth can make you vom.
You can get stretch marks on your hips as well.
There are many more!