What can I say ? Unicycling is the best sport in the world! ;-) Do you want to know why? See this wikipedia article
I've started unicycling in April  2006. I'm a level 2 unicyclist (unicyclist levels), and where ever I go, I try to carry with me at least 1 unicycle.

List of unicycles that I own:

• 2006-04-xx: 20" sort-of-freestyle unicycle. Photo.
• 2006-08-4: Torker Unistar DX 24". Photo.

Here is my Unicycle Blog!
Here are some pictures and videos of me unicycling: my site at uniclist.com
And here are some radom photos with my Torker DX unicycle: my wife, myself, and my uni.

 I'm learning chess, and I like it very much!

• I play in FICS, my handle is riqhi, and this is my ranking evolution.
• And I play in the club Colegio San Martin of Avellaneda

Here are some chess tactical exercises that I made based on the tournaments I'm playing/I've played

1. 2005-04-19 - sub1700-tactics.pdf : Exercises based on the sub1700 tournament.
2. 2005-04-19 - pre-pre-superior-tactics.pdf: Exercises based on the pre-pre-superior tournament (Rounds 1 & 2).
3. 2005-04-20 - pre-pre-superior-tactics-3-4.pdf: Exercises based on the pre-pre-superior tournament (Rounds 3 & 4).
4. 2005-06-13 - tonc4-round1-tactics.pdf: Exercises based on the TONC4 - round1.
5. 2005-06-21 - tonc4-round2-tactics.pdf: Exercises based on the TONC4 - round2.
6. 2005-06-27 - superior-tactics.pdf: Exercises based on the Superior tournament.(A tournament that some friends of mine have played)
7. 2005-07-04 - tonc4-round3-tactics.pdf: Exercises based on the TONC4 - round3.
8. 2005-07-18 - tonc4-round4-tactics.pdf (v1.1): Exercises based on the TONC4 - round4.
9. 2005-07-25 - sub1700-equipos-round1-tactics.pdf: Exercises based on the Sub1700 por equipos - round1. (.pdf en español: aca)
10. 2005-08-01 - sub1700-equipos-round2-tactics.pdf : Exercises based on the Sub1700 por equipos - round2. (.pdf en español: aca)
11. 2005-08-04 - tonc4-round5-tactics.pdf: Exercises based on the TONC4 - round5.
12. 2005-08-08 - sub1700-equipos-round3-tactics.pdf : Exercises based on the Sub1700 por equipos - round3. (.pdf en español: aca)
13. 2005-08-16 - tonc4-round6-tactics.pdf: Exercises based on the TONC4 - round6.
14. 2005-08-30 - sub1700-equipos-round4-tactics.pdf : Exercises based on the Sub1700 por equipos - round4. (.pdf en español: aca) 

And football (or soccer) is the other sport that I practice regulary.