I have qmail working and accepting email and forwarding mail appropriately except when I want to forward mail to my gmail account--forwarding to all other accounts seems to work well.

Messages are simply never recieved, no bounce, no nothing. Is there some sort of trick or header doctoring I have to do to make my mail actually make it to my gmail inbox?

What does your log say right after you send a message to your qmail account? Check /var/log/qmail/send/current.

@4000000042c4735b1fefb284 status: local 0/10 remote 0/20
@4000000042c4737d23e37a24 new msg 140738
@4000000042c4737d23e3f724 info msg 140738: bytes 994 from <blah@miscdomain.net> qp 18756 uid 201
@4000000042c4737d31335834 starting delivery 1: msg 140738 to local my-domain.net-me@my-domain.net
@4000000042c4737d314f63e4 status: local 1/10 remote 0/20
@4000000042c4737e14cd1c84 new msg 141184
@4000000042c4737e14cd9984 info msg 141184: bytes 1098 from <blah@miscdomain.net> qp 18775 uid 89
@4000000042c4737e20aeef8c starting delivery 2: msg 141184 to remote me@gmail.com
@4000000042c4737e20af8014 status: local 1/10 remote 1/20
@4000000042c4737e24476c14 new msg 141190
@4000000042c4737e2447f0e4 info msg 141190: bytes 1098 from <blah@miscdomain.net> qp 18786 uid 89
@4000000042c4737e3670f16c starting delivery 3: msg 141190 to remote @mail.my-domain.net
@4000000042c4737e367162b4 status: local 1/10 remote 2/20
@4000000042c4737e3672703c delivery 1: success: did_0+0+1/
@4000000042c4737e36733774 status: local 0/10 remote 2/20
@4000000042c4737e3674067c end msg 140738
@4000000042c4737e3a8456cc delivery 3: failure: Sorry._Although_I'm_listed_as_a_best-preference_MX_or_A_for_that_host,/it_isn't_i
n_my_control/locals_file,_so_I_don't_treat_it_as_local._(#5.4.6)/
@4000000042c4737e3a851e04 status: local 0/10 remote 1/20
@4000000042c4737f0a06d754 bounce msg 141190 qp 18799
@4000000042c4737f0a07583c end msg 141190
@4000000042c4737f0aa2e874 new msg 141185
@4000000042c4737f0aad8734 info msg 141185: bytes 1743 from <> qp 18799 uid 206
@4000000042c4737f1439b23c starting delivery 4: msg 141185 to remote blah@miscdomain.net
@4000000042c4737f144cb184 status: local 0/10 remote 2/20
@4000000042c4737f2b56f68c delivery 2: success: (me@gmail.com)_64.233.185.114_accepted_message./Remote_host_said:_250_2.
0.0_OK_1120170869_g9si446485wra/
@4000000042c4737f2b57ae24 status: local 0/10 remote 1/20
@4000000042c4737f2b5869a4 end msg 141184
@4000000042c473800d958bf4 delivery 4: success: (blah@miscdomain.net)_209.225.8.224_accepted_message./Remote_host_said:_250_ok:__Mes
sage_1197538440_accepted/
@4000000042c473800d9610c4 status: local 0/10 remote 0/20
@4000000042c473800d96820c end msg 141185

But now for some reason, I'm getting mail on my gmail account. *shrug*

It could be that I was originating the mail from my gmail account and sending it to my own server which bounces it right back to gmail--gmail must be dropping it because it was sent from the same gmail account originally.