I have to admit I wasn’t expecting to get my SourceForge project registration rejected this morning when I submitted it, but I guess it happens. They wouldn’t have an approval process in place otherwise, would they?
It seems Gmail’s forwarding feature does not really forward all mail (true for Apps at least). When you select “Settings->Forwarding and POP/IMAP->Forward a copy of incoming mail to” and set an e-mail there, only the e-mails sent to your literal address (“user@somewhere”) are forwarded. E-mails that were already forwarded to that address or sent with the ‘+’ suffix (eg. “user+tag@somewhere”) are *not* forwarded. You can’t even use filters to achieve this.
This sucks, because when using Apps and regular gmail account you most likely would want to forward a couple of aliases (eg. webmaster) to the main account@domain and then all coming to that to regular gmail. And you can’t use the ‘+’ suffix for the real address. 
Update: Okay, I was too hasty. Looks like the above holds true only for when you send e-mail from your regular gmail account to the Apps one. When sent externally, all mail seems to be forwarded regardless of whether ‘+’ suffix is used or whether it’s sent to the actual account (“user+tag”, “webmaster+tag”, etc. are forwarded).
