Well, we saved a bunch of money for my wedding thusly:
A friend of the family did the church flowers. (She could have done the bouquets too, but was too nervous).
Mum made my wedding dress; the mothers of the bridesmaids made their dresses.
I made and iced my own wedding cake (hobby of mine, I wouldn't recommend it unless you know what you're doing; and only if it's a cake which doesn't require last-minute prep!).
We made our own invitations, orders of service and wedding favours (little handmade triangular boxes with a few Hershey's kisses inside) out of matching paper.
Friends provided the music for the wedding--I have friends who play violin, piano and cello, and they did a gorgeous job. The music for the reception was a bunch of CDs we compiled for the occasion, but I can't honestly remember if they got played or not!
The wedding video was also friends; or rather, a couple just starting out in the wedding video biz who wanted to do a few free weddings to get their reputation going, and their mother knew us. Actually it was a bit of a disaster; I didn't want a wedding video, and it turned out not so good! But never mind.
The photographer was a professional wedding photographer who flew in from Australia to take our photos, because he had a crush on my sister.
We did pay for the hairdresser, but my sister made the bling to go in our hair--she attached little pearl beads and copper wire to bobby pins.
The makeup was another friend.
My engagement ring, which I adore, has a Ceylonese sapphire and two little diamonds, which are actually cubit zirconium. That saved us about $1000; it was in the 'dress ring' section of the store, not the engagement section (because they're all diamonds!). All I had to do was persuade DH that I couldn't care less whether the diamonds were actual diamonds or not (and seriously, I couldn't), and we had enough money to buy a very fancy knife set.
The wedding cars... two other friends of the family. Spotting a trend here?
The church--well, my dad's a pastor. So it was my childhood church, not gorgeous but OK, and free. The pastor, being my dad (tandeming with another family friend, so he could give me away), likewise free!
I realise you probably can't replicate all these conditions for your own wedding, but take a closer look at your friends and parents' friends and so on. Some of the 'friends' I mentioned weren't that close--for example, the makeup lady works with DH in a huge company. But it turns out, people LOVE helping out for weddings. I gave everyone who helped gift baskets, which I made myself (some homemade items, some fancy food, etc).
One thing I didn't do myself was the catering; my MIL was horrified at the idea and talked me out of it. She was probably right; the caterers did a fine job, and it was one thing less for me to worry about. My sisters and I went over to the reception place the day before and decorated it, while I assembled and decorated the cake. The place had these lovely glass tables with glass bowls sort of suspended underneath, and we filled the bowls with pot pourri and arranged my favourite books, open to places with passages about love, on top. Heaps of people commented and thought it was a great idea (and a few of my geekier friends were noted to have removed the books and read a few pages!).
I'm not sure if this is a money-saving tip per se, but we used flax flowers for decorating the cake, the reception and also in the bridesmaid's bouquets (mixed in with real white roses). They were lovely, and dyed the perfect shade of blue, which was better than trying to find blue flowers. I bought dozens of them and they came in handy for all sorts of things--decorative pew ends, you name it. That kind of tied things together. The other 'symbol' of the wedding was a (cheap!) Celtic knot rubber stamp and some copper paint. My wedding colours were cream, blue and copper, and the theme was 'A threefold cord is not quickly broken'; so the knot concept seemed to work. We printed out hundreds of copper knots, cut them out and used them to decorate the invites, the wedding favours, the orders of service. It was nice.
Good luck, and try not to stress too hard about the dress! Mum did mine, and we ended up changing the pattern a week before the wedding because she couldn't get something to work. It was stressful for her--I don't know if she'd call making it 'a joy' exactly!--but she was very proud and relieved when it was done. And it looked great.