SaveWalterWhite.com is the website created by Walter White Jr. in order to raise donation money for his father's rising medical costs. Walter Sr.'s criminal lawyer, Saul Goodman, convinces Walt that the best option he has for laundering his drug money is by sending small, but consistent donations through the website with the help of one of Saul's computer hacker friends ("Phoenix"). The plan inevitably works, but the results are a lot different than initially expected ("ABQ").
In real life, the site actually does exist, the only difference being that the "Donate" button links to the National Cancer Coalition's site. In August of 2013, AMC dropped the link to the National Cancer Coalition's site after they were named "America's Worst Charities" by Center for Investigative Reporting.