The phrase "about the plethora of" is correct and usable in written English.
It can be used when discussing a large or excessive amount of something, often in a formal or academic context.
Example: "The report focuses on the challenges faced by the industry about the plethora of regulations imposed by the government."
Alternatives: "regarding the abundance of" or "concerning the multitude of".
Holik was more philosophical about the plethora of penalties and what Robinson described as cheap shots.
Some years ago, the major credit card companies became concerned about the plethora of credit-card-number thefts from sellers' databases.
Two years ago, Guardian literary editor Claire Armitstead, rising from judging the Guardian first book award, was moved to complain about the plethora of ill-edited submissions.
I am deeply cynical about the plethora of books on Australia's involvement in the first world war, Gallipoli in particular, that are flooding our bookstores as Australia marks what it parochially calls the Anzac 100 centenary.
As long as politicians and commentators (academics included) continue to speculate about the plethora of factors implicated in radicalisation the same old narratives dominate the way in which we talk about tragedies like the Parramatta shooting and we learn nothing.
I've found that the Galley, the dining hall, which is quite similar to a standard college cafeteria, can be a great place to make new acquaintances and learn about the plethora of support and science programs on the continent.
We're not talking about buying the plethora of junk available for the royal diamond jubilee (an ice cream scoop in the shape of the Queen's face, anyone?).
That job, as well as one as head of security for the Port Authority, exposed Santa to, as the Washington Post put it in their story about him, "the plethora of ills that plague America's youth abuse, neglect, homelessness, institutionalization".
Yet as dismaying as I find the reaction of those who would seek to silence a college publication for writing frankly about sex, the plethora of dispassionate dispatches from the hook-up universe invariably make me want to hurl for other reasons.
Another nice thing about Bogotá is the plethora of outdoor cultural and athletic activies.
Or about any of the plethora of issues whose solutions will influence the contours of our society and help determine our place in the world for the generation to come.
