I consulted Google and found a few interesting articles that suggests that with ICSI the gender spread is pretty much 50/50 whereas with natural conception its approx 105 male to 100 females - Interestingly there was a common theme that mother nature does this because the infant mortality rate etc was higher with males etc so in laymens terms this 'evens things up'. One of the articles is here Fewer Boys Are Born After ICSI: Injecting Sperm Directly into the Egg Results in Fewer Male Births | Suite101.com

I found another article of interest too, but can't find it again

Andi - In a nutshell, if ICSI is used instead of normal IVF, there is really no statistics that significantly increase the chances of boys or girls, and whether its in the same stim cycle or not doesn't appear to make much difference as each fertilization is going to be independent of each other in reality, and with regards to the odds it is still only a matter of a few percent either way which is almost inconsequential I guess. I wonder if any of the IVF clinic's release stats on this though, would be very interesting wouldn't it!