This thread discusses a free seller financing book that you can request electronically (you'll have to google search some of the wording in the thread to get to a working link - forum rules removed the link that had been there):http://www.biggerpockets.com/forums/64/topics/123-free-seller-financing-book-is-a-must-

It's cloud based, easy to reconcile accounts, can accept rents electronically, etc. 

And what have you found to be the best ways to pay electronically?

I use basic electronic deadbolts.

If you have tenants that use the internet you could think of setting up some kind of electronic transfer like cozy.co (It is cozy.co not cozy.com). 

If the software is not simplifying your life or making you more accurate, you shouldn't use it.Software does have extremely helpful features like online payments, marketing syndication (click a button and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

I got an Electronics Tech degree and went on to get my MIS degree.

To prevent giving them 24/7 access to our unit, we installed an electronic lock that unlocks during each tenant's "laundry window".

I'd like to get your thoughts on the best method on how to receive rent electronically.

Electronic file looks the same.File for each bank account.