I'm supposed to be working now, but saw this thread and came on to share your pain. Weekends tend to pass here in a haze of cleaning, ferrying the kids to things, me working on my latest contract (in addition to my 9-5 during the week) and DH taking the kids off somewhere to let me have peace to work. One of these weekends we'll actually spend some time together, with adult company.
Could you set aside one weekend a month where you don't work, or where you work a minimum amount and perhaps do extra in the evenings in the week leading up to that weekend?