Is it too much to do a marathon the first weekend in May and a Half Ironman the last weekend in June?

I made the standard rookie mistake of overtraining and wound up with a shiny new stress fracture for my troubles.  Obviously I'm not running for 6 - 8 weeks, which means no PDX marathon.  I am wondering how much biking can I do?  How long should I wait to start biking?  Can I swim right away? 

Check out http://running4water.blogspot.com/ For every $10k donated through Running4Water to end the global water crisis, I am going to carry a gallon of water the entire distance of the Portland Marathon.

http://www.racecenter.com/blog/2008/06/ironman-oregon-possibility.html Has anyone else heard this might be a possibility?  How sweet would a Bend area full Ironman be. 

So I just completed my first triathlon.  Of course it was great.  I loved every minute of it.  I was definately strongest in the swim, but really enjoyed the bike and run.  I started running in March, only because I wanted to do Tri's.  I never attempted a tri before because of the run.  So I signed for a half marathon and started running.  Now I love it, and am so glad I started.  I am