A$650 camera that pays for itself in 3 hours:
www.houstonpallet.com
All of those shots were of the ceremony with plenty of light and it looks like he was using other lenses than the kit as well.
The kit lens indoors during reception, cake cutting, bouquet toss and all that jazz SUCKS.
For sure, just about all the reception action shots are with the 20mm. For me as a wedding videographer, that lens is pretty much the only reason to buy a GH1. With that lens it rocks at receptions, otherwise you're better off with a regular camcorder, IMHO.
One other neat thing about shooting weddings with the GH1: I've started getting all the obligatory static "detail" shots (venue, cakes, flowers, all that junk) by simply taking pictures. Then I can just drop them on the timeline, where I have Vegas set to display them for 6 seconds each (for example) and automatically crossfade them for 1 second. Then you can do pans/zooms on them if you want, without losing any HD resolution whatsoever...and they look way better than getting those shots with video. I fully implemented this tactic at my wedding this past weekend, and will have the "highlights" up in about 3 hours with the photos in it. I've already finished the highlights, and the fully edited 2-hours long version. Blu-Ray and DVD are being burned right now, and the B&G will watch their video when they get home from the honeymoon. I'm ALL about efficiency, and the GH1 does help in this regard.
For the OP thinking of using this for weddings with the 14-140, you'll also want the Lumix 45-200mm. It's equally crappy in low light, but it will give you the extra zoom reach similar to a camcorder, for church weddings when you're forced to shoot from the back or balcony. It's only $259. But then it's 45mm at the wide end, so you'll want to pick up a 2nd GH1 for a wide shot...so there's another $650.Hey, it's only money.
http://www.bhphotovideo.com/c/product/588078-REG/Panasonic_H_FS045200_45_200mm_f_4_5_6_G_Vario.html