Interestingly Sunday July 6th marked the 21st anniversary of LTTE's suicide bombings. They've of course mastered and executed them to perfection since then (including first using a female suicide bomber to kill ex Indian Prime Minister Rajiv Gandhi and also using a pregnant woman once) and its now a part of their normal repertoire of terror techniques.
Interesting article on Wikipedia on the topic too (of course).
BTW if you're interesting in keeping an eye on what's going on in Sri Lanka on the war front, defencenet.blogspot.com seems to give a good even-handed view of things. If you want the different sides check out defense.lk (note the proper English spelling of defence ;-)) and tamilnet.com.