Reply #1: Some of the ones I'm familiar with are

[Lydia Leftcoast]

Bach's Unaccompanied Cello Suites, which are kind of stark and cerebral

Elgar's Cello Concerto, especially Jacqueline DuPre's recording

Victor Herbert's Cello Concerto

Bachianas Brasileiras by Heitor Villa-Lobos has sections that are for soprano and cello

Antonin Dvorak wrote a couple of cello concertos for his son-in-law, who was a cellist.

There's also a piece by a composer called Popper (forget his first name), for three cellos and orchestra.

Look these up on iTunes and sample them.

Both string quartets and string trios typically include cellos, and a piano trio is typically a violin, a piano, and a cello.