I worked with my friend Clay last night to add POSIX signal handlers and additional fields to the DTrace apachetop Perl script:
$ apachetop.pl
21:12:39 Requests: 347 ( 69/sec) Bytes: 35349b (7069b/sec, 101b/request)
Requests: GETs: 347 POSTs: 0 HEADs: 0 TRACEs: 0
Responses: 1XX: 0 2XX: 301 3XX: 46 4XX: 0 5XX: 0
Requests Requests/Sec Bytes Sent URI
13 2.6 13312 /blah
6 1.2 0 /manual/ja/mod/directives.html
6 1.2 0 /manual/ru/mod/directives.html
6 1.2 0 /manual/de/mod/directives.html
6 1.2 0 /manual/en/mod/directives.html
6 1.2 0 /manual/es/mod/directives.html
6 1.2 0 /manual/ko/mod/directives.html
2 0.4 0 /manual/ja/mod/
2 0.4 0 /manual/es/mod/
2 0.4 0 /manual/de/mod/
2 0.4 0 /manual/ko/mod/
2 0.4 0 /manual/en/mod/
1 0.2 0 /manual/ja/mod/mod_negotiation.html
1 0.2 0 /manual/ja/mod/mod_isapi.html
1 0.2 0 /manual/ko/mod/mod_file_cache.html
1 0.2 344 /manual/ko/ru/mod/directives.html
1 0.2 0 /manual/ja/mod/mod_asis.html
1 0.2 0 /manual/es/mod/mod_autoindex.html
1 0.2 0 /manual/ru/mod/beos.html
1 0.2 0 /manual/ko/mod/mod_setenvif.html
This version more closely resembles the awesome apachetop C program, but uses mod_dtrace instead of FAM and the Apache access_log to retrieve request data. Hope folks find this useful!