I love .PL and I see a lot of opportunity in .EU and other European ccTLDs. I like .US too :)

Toss up between .US and .IN - I think they both have a huge amount of potential and you can find great deals and available keywords still. With the changes to .TV, I really like it too, but I've not invested nearly as heavily in it.

My prefered is .es, because I am dealing in this ccTLD's and I live in Spain.

I think in the next few years the value of the .es will go up a lot.

We are going to discuss this in a Domainers Conference on 24th of september in Valencia.

Mine is Dot US and Dot DE...then Dot CO.UK

.IN is my favorite ccTLD! I own over 150 .in domains. I buy mostly one word .ins or LLL.ins. Why?several reasons:

1.many already get traffic you can monetize
2. Lndia's population pressure will boost .in and internet use in India.
3. India is slated to have the most internet users by 2013(currently at 80 million) with over 250 million internet users.
4. Sales are sometimes slow, but they are occuring and the price range seems stable but increasing year by year.
5.India is a capitalistic country and the internet is relatively free,

Dn Abc

sorry but .com and .net are not country codes.

--

My fave is .US.

I think it's under appreciated and under utilized by US Citizens.  

I speak the language  -kind of  :)

If .US ever opens up and becomes non-restrictive, watch it take off at lightning speed.

Foreigners would really eat up the .US extension.  IMHO

.com or .net
I use a lot more tlds but these are my favorite.

.au because the rules so complicated

I realy love .SE because it's one of my favorite country.. :)