1. What are the top 5 U.S. Patent firms or attorneys, specializing in
Software patents? This can be based on reputation and/or infringment
cases won.

2. What are the names of some firms/attorneys with experience writing
patents related to speech recognition software?

1) The reputation question is a very hard question to answer. I assume
that you want to file a parent, not to sue someone for infringement.
So you don't want a litigation firm but the prosecution firm. Although
I understand why you asked the question, I think that any larger law
firm with software patents experience should serve you well. However,
here you will find some ratings:
http://www.ipww.com/texts/1104/software1104.html
http://www.patentratings.com/001/top_10_comp.sv

2) These firms have direct experience with speech recognition software:
http://www.fr.com/directory/directory.cfm?aid=273
http://www.bromsun.com/
http://www.howrey.com/news/index.cfm?fuseaction=news&newsid=724


You can also look at the following patents and find the counsels for
the applicants (some are filed by in-house counsel for IBM):

3936805 Feb., 1976 Bringol et al. 340/172.  
5522012 May., 1996 Mammone et al. 704/250.  
5550966 Aug., 1996 Drake et al. 395/154.  
5598507 Jan., 1997 Kimber et al. 704/246.  
5649060 Jul., 1997 Ellozy et al. 704/278.  
5655058 Aug., 1997 Balasubramanian et al. 704/255.  
5659662 Aug., 1997 Wilcox et al. 704/245.  
5857169 Jan., 1999 Seide 704/256.  
5864810 Jan., 1999 Digalakis et al. 704/255.  
6006184 Dec., 1999 Yamada et al. 704/246.  
6073096 Jun., 2000 Gao et al. 704/245.  
6073101 Jun., 2000 Maes 704/275.  
6108628 Aug., 2000 Komori et al. 704/256.  
6141641 Oct., 2000 Hwang et al. 704/243.  
6173076 Jan., 2001 Shinoda 704/244.  

I hope this helps.