The VRMC list is (to my knowledge) the most complete and thoroughly researched list of California Thirteeners; it was also the first such list published on the web (February 2000). However, there are certainly other perspectives on the most important Sierra objectives. Some of the following sites also include trip reports, routefinding info, etc. which can supplement Secor’s work:

Summitpost.org - A great collection of climber submitted trip reports, peak data and pictures that covers mountains all over the globe.

Climber.Org’s Sierra Peaks List - Steve Eckert has put together a superset of the SPS list, including summit register conditions, NAD27 & NAD83 waypoint data, links to Karpel’s peak pictures, ranger contact info, and bear box locations. Note that the Climber.Org list is restricted to peaks with official or unofficial names, and employs no saddle depth criterion. The Climber.Org site also includes related stuff such as peak lists for multiple states, trip report archives, email discussion lists, etc.

Peakbagger.com California 13,500-foot Peaks - Greg Slayden publishes many different peak lists for mountains all over the world. He employs software (WinProm) similar to RidgeWalker to find the locations of the key saddles, but then uses map contour data to report the “clean” prominence of each peak. He also has web site features allowing climbers to log in and keep track of which summits they’ve climbed, etc.

Lists of John - John Kirk has a number of different peak lists posted, including an independently developed California Thirteeners list. He uses straight interpolation from the USGS contour data to determine summit and saddle elevations that have not been surveyed. Please see my detailed analysis of his results.

High Prominence California Mountains - Aaron Maizlish has researched all of the mountains in the USA which rise at least 2000 feet above the surrounding area (also using WinProm). There are apparently 169 of these in California. He also maintains PeakList.org, where he posts lists of the mountains of the world with the highest prominence.

Sierra Peaks Section - This group of peakbaggers within the Los Angeles Chapter of the Sierra Club maintains by far the most popular list of Sierra peaks. Those little 3-peak scribbles over a number from 1-247 you’ve been wondering about in the summit registers are all due to these guys. I’m also working on my SPS list, but I prefer to scribble my 13’ers count in a little VRMC champagne glass instead.

Peakbagging.com - Richard L. Carey maintains a list of pointers to interesting peak lists. He’s also got trip reports, GPS waypoint info, etc.

Peak Picture Archive - Ron Karpel has been collecting clean pictures of Sierra Nevada Peaks and posting them on his site. His goal is to someday have a picture of every major peak, and he’s looking for submissions. He seems to be focusing on the Climber.Org list, but maybe he’ll eventually incorporate all of the 13’ers as well.

Climbing California’s Fourteeners: The Route Guide to the Fifteen Highest Peaks - Stephen F. Porcella and Cameron M. Burns’s guidebook includes great route descriptions for their list of fifteen 14’ers. Unfortunately, the criteria I use eliminate four of their peaks (Mt. Muir, Thunderbolt, Starlight, and Polemonium Peaks). These are all great climbs, though, and I recommend their book.