Did you have any say in which houses your agent contacted on your behalf?
Yes. But I should say that this was an important factor to me when choosing my agent, so I knew that I would from the get-go. Certain writers have no desire to be part of the submission process or to be kept abreast of it. They'd probably love to be repped by Miss Snark. I, however, like to know the nitty-gritty - both the good and the bad - and thus, looked for an agent who was more collaborative. (I should also note here that I'm sure that Miss Snark wouldn't want someone like me as a client - she's said as much on her blog - so I'm certainly not slamming her here. It's just a reality and what works best for different personalities.)
So, when I was speaking with agents, this was one of the questions I asked: will you let me know which imprints you submitted to and which editors? Not only did my agent happily agree, she asked for my input, since I'd been through the submission process before. I already knew the names of a few editors who loved my work (and a few who didn't, ha!), and she readily submitted to them. Just one reason that my agent and I click so well.