I picked up the 46 from Wal Mart Wednesday and I really like it so far. Great deal, btw.. might be one of the best bargains out there right now.
I'm still in the break in period as well. I've been using D-nice's break in procedure when I'm not watching tv, so hopefully that will help. I really hope that someone who knows what they're doing will post some service menu tweaks. This set looks great out of the box, but there are definitely some small tweaks that could take it to the next level. The white's are a little dirty (My first plasma, so I may just be used to LCD) and at times the green can be a little much.
You're right, the Standard setting is too dark. I was actually reading a review that said Panasonic made the Standard mode like that in order to make the TV energy star compliant. Apparently if you make a TV have a really dark power friendly default setting it can meet energy star requirements, lol. The settings I'm currently using are probably not as power friendly. Here's what I've been using lately.
Picture Mode - Cinema (Custom is good too, but I prefer the slightly warmer look of Cinema)
Contrast - 82
Brightness - 66
Color - 44
Tint - +4
Sharpness - 0 (May need to be jacked up for SD)
Color temp. - Warm
C.A.T.S., Video NR - Off