I've been building up a computer science library via ABE Books (http://abebooks.com), highly recommended), purchasing a couple of used books and a couple of new books each month.
Recently arrived used:
- Hoare, Communicating Sequential Processes
- Dijkstra, A Discipline of Programming
- Agha, Actors
Recently arrived new:
- Brodie, Thinking Forth
Some comments on these texts later.