Jeriod and CTA, tweak it to what works for you. There's nothing magical about intervals monday and tempo on thursday or temop on tuesday and intervals on friday. Do what works for you and your schedule. Personally, I would never come homeo on a friday and go hit hard intervals because mentally, I'm just ready for Friday after work to be a nice relaxing time. That's just me. But do whatever will allow you to recover. This might mean functioning on a non-weekly calendar:
A few years back I started doing this at a suggestion of an acquaintance. It was a bit odd to many folks but it worked very well. I started using a non-weekly cycle. Meaning I wasnt trying to fit everything into a 7 day box. I, too, was trying to build my mileage but keep some workouts going. I started using 8,9, and 10 day cycles. The 10 day cycle was cool because two of them fit into three weeks with an off day, so the calendar didn't get too screwed up. Also the beauty of the 10 day cycle was that I could get in some more longer runs than one per cycle, essentially keeping up the 1 long run per week idea so prevalent. As it turned out I was getting 4 long/longer runs per 3 weeks.
I've known people who did 14 day cycles also. Often times 14 day cycles that I have seen basically are just two 1-week blocks of training, so there's little difference, but it can be done right to allow enough recovery time between your workouts. There's nothing magical that says you MUST get in one of each of these kinds of workouts per week. You know your body. You know what you feel like after certain types of workouts. Tailor the training to fit your needs.
Examples of what I've done:
9-day
1 long run, morning
2 double day
3 easy, afternoon
4 temop run, morning
5 double day
6 easy, afternoon
7 intervals
8 double day
9 easy
I was really trying to get more mileage in this program. that was the main idea. Doubles helped accomplish that. I know malmo would say there are many more days in there I could have doubled, butI was not used to running them. The tempo run was generally longer than the standard 20min T like Daniels advocates. Obviously pace was modified slightly, mainly by feel though. Intervals were mostly more relaxed intervals like 'cruise intervals' and I guess what would qualify as 'groove' per MPR above, not the really hard vo2 max pace intervals. Again, mostly by feel. I would often start what felt really under control, kinda easy, and get a little faster each one, but not always. The doubles were moderately long (for me), something like 6 and 9 most days. The tough part of this was the calendar and my mind kept wanting to come back to 'how much per week am i running?' since that's how everyone else thinks. So I started doing a 10 day cycle after I read a couple articles about Jerry Schumacher's group using progression runs and other marathon based groups using long progression runs as conerstones of their training over the whole year.
10 day plan:
1 progression run
2 double
3 easy
4 intervals
5 easy
6 long run
7 double
8 easy
9 tempo run
10 easy
In this plan I decided to run the tempo run shorter but faster much like the Daniels idea. The progression run I built up to 10 miles. Totally off of feel. Start with an not quite easy run and after a few miles start letting myself slowly build faster until the last 2-3 miles were aobut as fast as I was running my previous 6 mile tempo runs. I would usually put in an easy mile cool down on the end also. So...while it's not a true long run, the progression run was longer than all the other runs, plus the long run of 12-13.
Hope this gives you some ideas about how to schedule your training in a way that can allow you to recover more and still get what you need.
By the way, it was during about a year and half time that I was doing this for myself that I set PRs from 5K to HM, after college.