Funny i just came across this thread now because i just tonight pulled out a book i bought called "choose the sex of your baby" sorry if you have already discussed this previously in this post.
So a few hints for TTC a boy are:
1. The mans genitals should be kept cool in boxer shorts or underpants and loose trousers
2. Abstain from sex for one week prior to ovulation or less (generally men with higher sperm count produce more boy sperm)
3. when the slippery O mucas is present make love ONCE while the sperm count is high.
men with a known low sperm count may be helped by a cold sponge of the genitals (cant imagine they'd like that lol)
4. Oh also it is best if trying for a boy for the female to orgasm before(tell your DH's this one!!) because when a woman reaches orgasm she releases alkaline fluid which favours male sperm.

Im reading up on how to conceive a girl atm, to me it seems like it will be harder to conceive a female!
For Nixon (even thought we were not activly trying i had read up on everything) we BD only once and had not BD for atleast a week prior, It was on the day of Ovulation aswell, and i also had a happy moment b4 hand! so we were pretty sure we were havig a boy (end up finding out @ ultrasound too)