What's the best thing to do for evil, mutant blisters?

Plain ordinary sticking plaster. the cotton backed sticky tape you get at the chemist. NOT i repeat NOT badaids or special blister bandaids. Plain ordinary sticking plaster tape.
You need to stop movement of the blister against whatever it is rubbing against and allow the skin to breathe. the cotton backing on the tape allows this to happen

Tape over the complete blister and surrounding area with several layers, as tightly as possible without causing pain. if this means going round your foot several times, do so. This kind of tape is usually available in a variety of widths so get narrower stuff to go around toes and wider tape for the rest of the foot.

I've used this so many many times it not funny, and it saved my life in Edinburgh.

Take the tape off at night just before bedtime and dry well after bathing using a hairdryer if convenient. Re-apply tape next morning. Repeat as required.

I disagree with any kind of soaking unless real infection is present. If that was the case use warm/hot salty water.

No additional suggestions for your blisters but, if you'll excuse the digression for a moment, how are your ribs?

Another consideration might be the impact on your blisters of shoes you wear to work, etc, Deb. (ie your non-walking shoes.)

This is a curious thing, Deb.

Prevention seems to be the key thing here. 2 pairs of socks SHOULD help prevent blisters. Even if they are quite thin for your work shoes. You can get sock liners here for wearing under other socks.

And I'd go see a podiatrist, too.

use the tape deb.

<starting to see dadpad's point>

Amazon sells moleskin.

http://www.thewalkingsite.com/blisters.html

Our dance instructors always tell us to have an epsom salt footbath after particularly tough practice sessions (to prevent blistering) as well as if people have blisters (to help dry out the blisters).

I used to have problems with blisters until I got better at selecting shoes with enough room for appropriate socks.

Hereabouts: Walmart, Walgreens or Osco Pharmacy. In Oz: chemist, I would think.

Dr. Scholl's sells them:
http://www.drscholls.com/drscholls/index.jsp
http://www.amazon.com/Dr-Scholls-Moleskin-Padding-Strips/dp/B001OPJ8KS/ref=pd_sbs_hpc_1

Hmm, I disagree. I flat LOVE my crocs, and would wear them 24/7 if I could get away with it. I often change into a pair around the office. I go anywhere/everywhere in them. I've read about someone who hiked the Appalachian Trail in a pair. I see nothing wrong with walking great distances with them, and I have found them to be, by far, the most comfortable pair of footwear I've ever owned.

Another idea might be "Nu Skin", which is a liquid bandage. Supposed to be good for blisters. I've used it for cuts, but not for blisters, so I cannot vouch for it. Stings going on, that's for sure.

http://www0.epinions.com/reviews/New_Skin_Antiseptic_Liquid_Bandage_1_Fl_oz/sec_~opinion_list/pp_~2/sort_~prdrt/sort_dir_~des

Maybe put Nu Skin on, then cover with moleskin.

Crocs are dead ugly but I hiked all through Thailand in a bright orange pair, not a blister to be seen. However, they are a dangerous choice when they or your feet get wet.
My best friend constantly gets blisters, doesn't matter what type of shoe. I think some people are more susceptible.

I suggest that you may have an onset of type II diabetes. Thats been awfully long for them not to heal. Stop yer exercise until you get them to heal

I'll give it a go!!!

Nah...they're from the long distance walking.

Thankee.

Definitely podiatrist.

I'll have a look...thankee.

Oh, they heal fine...they just get renewed whenever I walk a long time. That is, a new blister forms under the healing one.