If you're interested in browser-based games, here are some games you can have a try:
http://gamelist.bbgsite.com/goto/supremacy-1914.shtml
Supremacy 1914 is a free online multi-player real-time strategy RPG. Power obsession and the hunger for resources have brought the continent to the edge of self-destruction. Form powerful alliances, build your economy, and prepare your nation for the war. Lead your men into battle and become the ruler of Europe.
http://gamelist.bbgsite.com/goto/wartune.shtml
Wartune is a Strategy Hybrid MMORPG released by R2games.com & Proficient City Limited. In this exciting strategy/RPG hybrid game, the action begins with the first click! Featuring three unique classes, single and multi-player dungeons, PvP arenas, competitive battle grounds, thousand-player boss battles, a robust guild system, and farming, Wartune combines some of your favorite features from multiple game genres. Whether you consider yourself a casual gamer or a hardcore veteran, Wartune will keep you coming back for more.
http://gamelist.bbgsite.com/goto/chaos-of-three-kingdoms.shtml
Chaos of Three Kingdoms is a Free to Play Browser-based MMORPG game from RenRen Game. It is the most expected web game in 2011, the owner of Golden Feather Reward in 2011. Moreover it creates one more new version in Strategy game. Hundreds of real players around the world interact in real time, to fight, to unite, to chat and to cooperate, etc.
BTW the annual best browser games event on BBGsite will start soon. They will choose the best browser games in this year, including the best strategy game. You can stay tuned on it. Here is the event page: http://contest.bbgsite.com/gameprize/2012/index.php