Firebird Scalability, by Dmitry Yemanov (in English)
Professional tools for Firebird optimization and maintenance from IBSurgeon
Life with big Firebird databases
Firebird 2.5 Architecture, by Dmitry Yemanov (in English)
Firebird for ISV: Business Advantages (in English), by Dmitry Kuzmenko, IBSurgeon
Firebird Anti-Corruption Approach
Firebird 2.5 Benchmark, by Tsutomu Hayashi (Tomneko)
Firebird Security (in English): The Past and The Future
Firebird 2.1 What's New by Vladislav Khorsun (English)
Новые возможности Firebird 2.1 (in Russian, Vlad Khorsun)
Firebird migration: from Firebird 1.5 to Firebird 2.5
How IBSurgeon can help you diagnose, fix and prevent corruptions of Firebird and InterBase databases
Open Source: взгляд изнутри, Дмитрий Еманов (The Firebird Project) (in Russian)
Firebird Roadmap-2006 Текущее состояние разработки и перспективы развития (in Russian), Dmitry Yemanov
Решения на базе СУБД Firebird в крупных компаниях и государственных учреждениях (in Russian)
Firebird's Big Databases (in English)
Firebird DataGuard - Еще раз об уверенности в завтрашнем дне
FBScanner: IBSurgeon's tool to solve all types of performance problems with Firebird
Firebird 2.5 - вектор дальнейшего развития, Dmitry Yemanov, (in Russian)
Firebird: cost-based optimization and statistics, by Dmitry Yemanov (in English)