Box Office Mojo

The website boxofficemojo.com is a very good resource in terms of identifying how successful (or otherwise) particular films are. For example, a genre search on "Romantic Comedy" provides the following data (these are the top Romantic Comedies of all time):

Rank	Title (click to view)	Studio	Lifetime Gross / Theaters		Opening / Theaters		Date
1	My Big Fat Greek Wedding	IFC	$241,438,208	2,016	$597,362	108	4/19/02
2	What Women Want	Par.	$182,811,707	3,092	$33,614,543	3,012	12/15/00
3	Hitch	Sony	$179,495,555	3,575	$43,142,214	3,575	2/11/05
4	Pretty Woman	BV	$178,406,268	1,811	$11,280,591	1,325	3/23/90
5	There's Something About Mary	Fox	$176,484,651	2,555	$13,740,644	2,186	7/15/98
6	The Proposal	BV	$163,958,031	3,158	$33,627,598	3,056	6/19/09
7	Sex and the City	WB (NL)	$152,647,258	3,325	$57,038,404	3,285	5/30/08
8	Runaway Bride	Par.	$152,257,509	3,240	$35,055,556	3,158	7/30/99
9	Knocked Up	Uni.	$148,768,917	2,975	$30,690,990	2,871	6/1/07
10	As Good as It Gets	Sony	$148,478,011	1,837	$12,606,928	1,572	12/23/97

The top ten films of this year (in the US):

1	Harry Potter and the Deathly Hallows Part 2	WB	$381,011,219	4,375	$169,189,427	4,375	7/15	11/24
2	Transformers: Dark of the Moon	P/DW	$352,390,543	4,088	$97,852,865	4,088	6/29	10/13
3	The Hangover Part II	WB	$254,464,305	3,675	$85,946,294	3,615	5/26	9/15
4	The Twilight Saga: Breaking Dawn Part 1	Sum.	$247,300,000	4,066	$138,122,261	4,061	11/18	-
5	Pirates of the Caribbean: On Stranger Tides	BV	$241,071,802	4,164	$90,151,958	4,155	5/20	9/29
6	Fast Five	Uni.	$209,837,675	3,793	$86,198,765	3,644	4/29	8/11
7	Cars 2	BV	$191,438,939	4,115	$66,135,507	4,115	6/24	-
8	Thor	Par.	$181,030,624	3,963	$65,723,338	3,955	5/6	8/25
9	Captain America: The First Avenger	Par.	$176,654,505	3,715	$65,058,524	3,715	7/22	11/10
10	Rise of the Planet of the Apes	Fox	$176,598,171	3,691	$54,806,191	3,648	8/5	-