Slip on Walking Shoes

Try a nursing type clog, they are meant for people on their feet constantly, and most of them have a back strap, so you can slide them on to get out of the house and once you get where you are going, it will only take one second to flip the strap to hold the shoe on.
One of my co-workers finds them so comfortable, that she bought them in 3 colors and wears them all the time.

Something like this...
http://www.allheart.com/oxclara.html?campaign=cseshopping

Clarks are the best I've found. Lots of slip-on styles and they are truly great for your feet!
If there's a Marshalls where you live, that's the least expensive place to get them that I've found.

Clarks are great but a little dressy (at least I find) for staying at home. I used to wear them when I worked at a school though and they offer great support. Some are better than others so if you go that route make sure you try them on.

You can find some Birkenstocks online or on Ebay that are made out of "Birko-flor" which is a faux leather material....I have a pair, and I swear, they feel just like real leather, you can hardly tell the difference. Of course, you can get the original leather ones too, they are great, but more expensive and a little easier to "ruin". Birks are great, I walk my son to and from school and most days I wear these and I love them. It feels like you are walking barefoot and there is great arch support. They do take a little getting used to (esp the backless ones) but once you break them in a little and get used to it they are FANTASTIC. Here is an example on ebay ...there are tons of different styles though
http://cgi.ebay.com/Women-BIRKENSTOCK-FLORIDA-Birkoflor-S...

There are so many popular kinds of slip-on shoes right now.

Sketchers has a ton that are more like an open tennis shoe:
http://www.skechers.com/shoes-and-clothing/styles/casual_...

I have a pair from Clark's that I love as well:
http://clarks.zappos.com/

There was a pair from LL Bean I wanted to get this summer:
http://www.llbean.com/llb/shop/63392?parentCategory=50343...

Personally, I wear my running shoes almost all the time because I need orthotics to help with my arthritis in my feet (nice diagnosis in my late 20's). I just keep them loosely tied most of the time to be able to slip them on and off and then lace them tighter when running.

Good luck!