I am not sure about the rest of the world, but here are the top ten destinations for Japan's Official Development Assistance (ODA) for 2000, 2001, and 2002:
| Rank | 2000 | 2001 | 2002 | |||
| Country | Amount | Country | Amount | Country | Amount | |
| 1 | Indonesia | 970.10 | Indonesia | 860.07 | China | 828.71 |
| 2 | Viet Nam | 923.68 | China | 686.13 | Indonesia | 538.30 |
| 3 | China | 769.19 | India | 528.87 | India | 493.64 |
| 4 | Thailand | 635.25 | Viet Nam | 459.53 | Viet Nam | 374.74 |
| 5 | India | 368.16 | Philippines | 298.22 | Philippines | 318.02 |
| 6 | Philippines | 304.48 | Tanzania | 260.44 | Pakistan | 301.12 |
| 7 | Pakistan | 280.36 | Pakistan | 211.41 | Thailand | 222.43 |
| 8 | Tanzania | 217.14 | Thailand | 209.59 | Azerbaidjan | 141.84 |
| 9 | Bangladesh | 201.62 | Sri Lanka | 184.72 | Bangladesh | 122.72 |
| 10 | Peru | 191.68 | Peru | 156.52 | Peru | 119.58 |
| Total above 10 | 4,861.64 | Total above 10 | 3,855.50 | Total above 10 | 3,461.10 | |
| Bilateral Aid Total |
9,640.10 | Bilateral Aid Total |
7,452.04 | Bilateral Aid Total |
6,725.91 | |
It looks to me like for the net money distributed to the top 10 recipients, about $3 billion went in 2002 to East or South Asia, with a little bit for Central Asia and a little for South America.
Looking at all projects individually (which you can do here) it appears that for all projects in the area it came to 531,245 million yen, or about 5.2 billion dollars in ODA for the South, East, and South-East Asia. (Note, these are new fundings, whereas the above table is net disbursement.)
However, unlike many countries, Japan's aid generally has a loan component, though the interest rates are very low. (When I say generally, I think it's about 60% of the money going out is in the form of a low-interest loan, the rest being in the form of a grant.)
If you are interested in the flow of funds for 2002 (which lets you break out the netting a bit), you can find them here at the Ministry of Finance.