The Novel:

          *1811 First Edition [Egerton](at books.google.com) vol. I; Vol II [Vol. III not yet available]
*1833 Bentley edition (at books.google.com)   (complete)
          *1896 edition (Hugh Thomson illustrated) (Internet Archive)
*The Novels & Letters of JA (1906; Brock illustrated) vol. I; vol. II
          *R.W. Chapman’s 1923 edition vol. I

*Brock’s illustrations (solitary-elegance.com)
*Audio at LibriVox
Principal Characters in S&S:

• from Wikipedia
• from Pemberley (genealogy of characters); also their Janes-names list
• Index of all characters, from Chapman’s 1923 edition (pp. 427-9)

Books:

1. Perkins, Moreland.  Reshaping the Sexes in Sense and Sensibility.  Charlottesville, VA:  Univerisity of Virginia, 1998.

S&S Links:

• Where’s Where in Jane Austen’s Novels: a map of all the places in Sense & Sensibility courtesy of JASNA and JASA (and the intro page with explanation & links to all maps). 
• A Calendar for Sense & Sensibility by Ellen Moody

S&S posts on JAIV:

1. Travel in Sense & Sensibility:

• Thoughts on Travel in Sense & Sensibility – Part I
• Thoughts on Travel in Sense & Sensibility Part II
• Travel in Sense & Sensibility – Part III – Carriages
• Travel in Sense & Sensibility – Part IV – Carriages (cont)
• Travel in Sense & Sensibility – Part V – Carriages – Regency Sport Cars