so in march 2007 your spouse will be applying for ILR based on 2 years of marriage. right?
i have looked through the relevent application and it appears that you do not need to list all the comings and going of your husband (unlike other ILR applications). However, it does have a section where you must show that the non-UK spouse must show permanant and continueing settlement. this is done through mail/bills/etc. You must show 10 docunments from each year (20 in total). These can be a combindation of addressed to both, you, him, etc... Lola has written a very good post detailing what exactly she brought with her for her ILR application.
As i illuded to above, there are limitations on how long you can be out of the country with a work permit based ILR. but I cannot find anything that limits the amount of time a USC with a marrige based FLR can be out. hope some of this helps.